

The Series 7 screen is exceptional, maybe a smidgen brighter than the iPad and somewhat sharper, at least with my eyes. Here's some side by side pics:
In short:
x220t Pros: Fast, nice IPS matte screen, great keyboard
x220t Cons: Digitizer issues at edge:
Series 7 Pros: Half the weight of the x220t, fanatastic screen tough glossy, very accurate pen
Series 7 Cons: Some early units shipping with screen adhesive problems, not as fast as overall the x220t with ULV i5