Flying SFO-IST late August. First time on Turkish Business class. Have heard great things about it, especially on the 787.
I'm 6'4"/194cm and also size 14 feet.
Which aircraft configuration has the longest lay-flat bed?
Also, some airlines (even luxury like SQ) have small foot-wells that my big feet do not fit into. What is the footwell like in the various aircraft?
Is it like some airlines where there is more legroom and a more open foot area on the bulkhead seats?

Also, my preferred date only has A350 or 777. I could wait one more day and fly on the 787.
Is the 787 so much better it is worth flying a day later for?
What is the difference between seat comfort, etc on 787 vs 777/A350?

Thank you.