heh!
This is comparing apples and oranges and peaches and apricot. :-).
The european International sectors in business on LH / BD / OS / SK are all glorified coach seats, more like E+ on united.
If you end up on the charter type OS flights (say to KTM), then it's not much to talk about.
In Asia, with TG - they have an air-plane lottery on many sectors, so you may get really old seats in business on long haul. In short haul flights, most often it's the old seats. - but of course, their service is always good.
But NZ have some old seats on their internationals on the pacific islands.
In North America, I have been only on UA C, and they are OK, but they don't even compare with LH C.
Can't comment on Asiana / ANA / AC / US / RG / LX, as i have never been in C in them.
Overall, SQ seems to be the most consistently 'not bad' !
But, of course my opinions are skewed towards seats - as that's what you look at when doing International long haul.