A 34" door clearance is about 32 1/2" where a 36" door clearance is about 34 1/2", and much depends of if the door is in a hallway or any objects or walls in the room its going into can potentially be a problem. Outside dimensions of a sofa should be know so that you can measure any doorways before purchasing.
The other option is to purchase a "ready to assemble" sofa, then doors, stairways, elevators and other obstacles isnt much of a problem.
Try google search "ready to assemble" leather sofa or "ready to assemble" custom leather sofa to ensure more options to find the best style for your home.

Is ready to assemble idea proves beneficial. i prefer adjustable sofa sets as they can be easily adjusted and are comfortable.

You should try Mackey Sofabed. It offers bold styling and a firm seating area, folding down into a comfortable and spacious bed. Covered in black vinyl, this sofabed is easily cleaned and maintained.

American Leather sofas might work, they are more modern and narrow/low back.

There are many choices of leather sofas. Your may choose according to your style and budget. Leather sofas are available in different price range. You can buy partial leather, simulated leather or full leather sofas. If you would choose a full leather sofa, buy the Italian leather sofa. This is great piece of furniture because its durability and elegance are unmatched by ordinary sofa sets.