If one is 6'4" none of the modern Biz seats on most airlines, especially on A350's/787's is truly good. These seats are generally made for people under 6'2" and quite slim. They are rarely wide enough and are certainly too short, with foot coffins. This includes practically all "suite" products, and other than the ex-Aeroflot planes, I always prefer 777's or A330's with TK over the newer aircraft. Airlines with Herringbone configs are generally good to 6'4" or so, With the former Jet Airways and CX having the longest ones (designed really for people up to 6'6"). Now I am sure that someone is going to come in and tell me that Starlux or Garuda have excellent long/wide products, or that SQ has wider biz seats, but what I have written is generally how it is.