You shouldn't see a great difference. The 4 at the front is the luminance, the second number is the luminance minus (I think) the red and the last number is the blue, if I remember correctly (too lazy to google it) all worked out with maths to get the levels of the colours. So full HD is 4:4:4: although 4:2:2 is generally said to be "broadcast quality" (whatever that non-existent standard really means nowadays) such as BetaSP and 4:2:0, if I recall was DV quality. Since a lot of footage shot on DV was copied onto BetaSP and "sold" as 4:2:2 I suspect that the actual difference is more interesting to those who look at waveform monitors, than those who look at pictures.
I have a feeling that, in theory 4:2:0 was supposed not to be quite as sharp as 4:2:2 when shooting interlaced, can't remember why.
I've not been a lot of help have I?