canon does have a bit more vividness in their default colors, but you can adjust colors in most cameras. i don't see a greenish cast to my LF1 pics, but at default they are a little less vibrant than canon's colors.
i'm actually about to sell my LF1 because of the EVF. i wear glasses, which might make some difference, but i find the EVF doesn't show me the entire picture i'm shooting well, and you have to sort of work to see everything. i was SO excited when i bought my LF1, but now i wish i'd taken my husband's suggestion and bought a G15 - his G15 has less zoom, but while the EVF isn't sharp, it does show everything in frame, and it does very well in low light.