Having owned both PS3 (Fat) and Slim and a DV137 and now DV139 I'd say I prefer the look to the upscaling from the Arcams.
The PS3 is technically superior (i.e. you will probably never see any scaling or deinterlacing artifacts) but with film material I always preferred the Arcam even over my XE1.
However, the DV137 did struggle with video material on occassion giving the odd weird artifact but is still good.
Now my DV139 is the Daddy