perhaps i am splitting hairs or maybe in this case eyelashes
first image is dpp preview crop screen shot
second image is acr6.7 crop screen shot
shot at f2.8 1/500 sec ISO 100 AWB
these are 100% crops
obviously 5D mk3 and lens is the 50mm f1.4 canon
These samples are pretty interesting. I think one of the core problems is the color rendition. In terms of sharpness, if you look at that lone strand of hair on her cheek, it actually looks sharper and has a cleaner edge in ACR, the DPP one looks a bit fuzzier and has more aliasing. If you really closely inspect her eye (the one in focus), from a sharpness standpoint they seem to be nearly identical, with DPP having a slight edge on sharpness. I don't think the difference in sharpness actually has to do with sharpness though. I think DPP introduces more microcontrast due to however it is demosaicing, where as ACR seems to use less...and I think the color (which, imo, looks rather off with ACR) seems to do a good job making fine details look less sharp even though at a pixel level the same exact detail is there.