I flew 40+ hours on the world's best business class, and it definitely lived up to its title

After dinner in Dallas, Texas, my brother dropped us off at Dallas Fort Worth International Airport. Although there were well over 100 people in line to check in, Qatar Airways had a dedicated line for business-class customers.

The agent verified our documents, confirmed that our bags were received from our earlier flight, and issued boarding passes before directing us to the lounge.

Upon entering the lounge, we were greeted with a glass of champagne. We immediately settled into chairs with our friends who'd just arrived. The lounge was comfortable and had a self-serve bar and a buffet.

Agents were calling for business-class customers, so we boarded quickly and avoided the long line.

Qatar Airways debuted its Qsuite business class in 2017. Qsuites allow you to turn four seats into a mini-quad cabin for privacy and comfort.

My mom and I selected two forward-facing seats for more separation, and our friends chose seats that converted into a double bed.

I was impressed with the spaciousness of the suite and loved the privacy doors — there was even a do-not-disturb button.

Most airlines reserve pajamas for first-class customers, but Qatar Airways offers them to those in long-haul business class.

I changed into a pair from The White Company — its pajamas retail for over $100 — in the oversized business-class bathroom filled with products from the French luxury brand, Diptyque.

We were also offered an amenity kit filled with self-care samples and a chilled towel.

Although I was tired, I indulged in a glass of 2007 Laurent-Perrier Grande Cuvee Alexandra rosé — which is priced at over $150 a bottle — and a cheese plate.

The flight attendant also insisted I try a glass of De Bortoli Noble One Botrytis Semillon, an Australian dessert wine.

The flight attendants completed our pod set up by topping our beds with a linen-covered mattress. I fell asleep immediately.

I woke up and reset my watch to Nairobi, Kenya, time before ordering lunch.

Qatar Airways offers a dine-on-demand policy, so you can order anything from the menu at any time. I was offered a small amuse-bouche bowl of corn chowder to start. I selected the tandoori prawns with a kachumber salad as the appetizer and the chicken biryani for my main.

Everything was flavorful and something I'd be happy to have in an actual restaurant.

Although I was full, the flight attendant insisted I should try a bite of dessert. I tried a delicious key-lime cheesecake and a cardamom-chai tea.

Given how long this flight was, I ordered a cheeseburger with sweet-potato fries for dinner. I paired this with a bloody mary and a glass of Bordeaux.

I also got tea service, which came complete with scones, sandwiches, and pastries.

The Hamad International Airport in Doha, Qatar, was stunning. I saw great shopping, dining, and art installations. The most iconic art piece on display was the massive 20-ton teddy bear by Urs Fischer.

Business-class customers here can choose between two lounges, so we selected the recently opened Al Mourjan Garden Lounge.

This space is nearly 80,000 square feet and has 24 quiet rooms, a not-yet-opened Dior spa, shower suites, and plenty of seating overlooking the airport's beautiful architecture.

The lounge had a buffet, a deli, and a well-stocked bar. There was even a sushi bar, where I ordered a couple of rolls that tasted fresh.

This flight offered lie-flat seats — seats that recline at an angle rather than a full 180 degrees — instead of Qsuites.

I skipped dinner since the flight departed at 2:00 a.m., and managed to get five hours of sleep. I woke up 45 minutes before we landed, and was served an express breakfast with an almond-praline clafoutis, a croissant, and a saffron-chai tea.

A representative from the lounge met us at check-in and escorted us past the security lines, through immigration, and into the lounge.

A waiter asked if we would like anything from their limited menu, including curried french fries and samosas.

We were a bit confused when we got to the gate to find an aircraft from Oman Air at the gate.

The gate agent explained that Qatar Airways leases these planes to increase their operational efficiency, but are still serviced by Qatar Airways.

Although I enjoyed the wider footwell, the seats felt a bit narrower than the other flights we'd been on.

The service on this flight was excellent. I selected the pumpkin soup with a salad of poached red lobster and red snapper. I had coconut curry with sesame-basmati rice for dinner, followed by a vanilla panna cotta and passion fruit for dessert.

Qatar Airways offers a super-luxe immigration channel for business-class customers, so customs was a breeze.

We had a long layover in Doha, Qatar, so we booked a room at the Mandarin Oriental, Doha, and headed back to the airport in the morning.

Similar to our arrival experience in Qatar, there was an exclusive departure channel for premium passengers.

Our return flight to Dallas was consistent with our outbound journey. Over the course of about 15 hours, I was treated with good food and got restful sleep. I also paid $10 for an internet pass to catch up on work.

Although there was no caviar and the footwells were a tad smaller than first class, the services and overall experience were top-notch. This was definitely the best business-class experience I've ever had.