as somebody with impressions from multiple psp's and ipt's (no iphone, though), i've noticed the following:
* psp has horrendeous ghosting, inconsitent across the colors either, i.e. some colors ghost more, some less. in contrast, i've noticed zero ghosting on the ipt so far.
* a week 49/07 ipt here tends to be slightly on the washed-out (blue) side of colors. i'd say in line with the current desktop series by samsung (the 2ms 3k:1 ones) - over-saturated, sub-par colors.
* another ipt here from week 01/08 has no blue washing-out at all. no ghosting either. impressive dark tones - i'd venture to say better than my mid-grade desktop LCD.
in terms of ghosting, i'd rank the above devices as:
* ipt (from either week) - excellent, no complaints whatsoever.
* psp (all i've seen - phat, slim etc) - quite poor
in terms of truthfulness of the color reproduction:
* ipt 01/08 - impressive. not ideal, but stands above most devices of this class.
* psp - impressive, but the moment that picture moves it all falls apart into a ghosting mess.
* ipt 49/07 - average, but consistent.