of course there will be a quality difference - it's just maths!
divide 1920 pixels into 24 inches and then divide it into 42 inches!
secondly, the LCD's of well known brands have better color, but IMO I'm happy with the color of mine.
some of the stores i've seen that display the Sony's are very nice, but they put it on "demo mode" - and some of them are actually TOO bright hehe
I don't want stuff to look that neon, it has to look natural.
but they are awesome though!
You won't be disappointed gaming on a Sinotec, but know that it won't have a 22" LCD's quality if both have a resolution near 1920x1080, and know that you WILL need a good card to game at that resolution.
on the plus side, It can be viewed from weird angles with no color fading, like some PC LCD's have, and my Sino also has a uniform Black across the screen - both PC LCD's I have, have a kind of blue tint from the sides & bottom (especially at the bottom)
that sums it up from my side, anything else?