The negative in a 645 camera isn't really that much larger than 35 mm. Most medium format pros will be found using Mamiya's in 6 x 7 format or Hasselblad's in 6 x 6.
#6 since the specular highlight on the nose is gone. I like the extra scruff, so #3 is out. #4 and #6 are very similar except for the nose. So, for me, #6 wins by a nose.... (sorry...)