I can't comment on the Sony, but for detailed and accurate photo
editing, you want to get an 8-bit per colour panel that displays all
16.7m colours. A 6-bit panel can only display 256k distinct colours,
so the panel dithers the display to simulate 16 million colours. The
trade-off is speed - most fast panels like 8ms or under use only
6-bits per colour since it's a lot easier and cheaper to manufacture.
The 8-bit panels tend to be slower, but have more colours. If you're
not a gamer, then look for a monitor that specifically states it has
an 8-bit panel.
If you find a model you like, but it doesn't say if it's 8-bit, then
look at the specs for speed and colours. If it states that is has
anything other than 16.7 million (like 16m or 16.2m), then it's a
6-bit panel.