I took the same shot with a Minolta Rokkor 55/1.7 & a Pentax Super Takumar 55/1.8 set wide open on my G1. They were shot in jpeg with the camera white balance set to shade & are presented here unaltered except for resizing.
First the Rokkor:
this is the Super Takumar:
I think the Takumar renders more vivid colour.