I am a GH2 owner and personally I am a huge fan of Canon FD lenses which you can usually buy for cheap money on B&H or EBAY. The quality in these lenses I find to be more pleasing than the digital look of the lumix series lenses. The only problem is the crop factor which will make your 50mm Canon FD lens into a 100mm. They aren't electronic so you have to manually operate the aperture and focus settings. If you check out the fotodiox graduated Canon FD mount to micro 4/3 adapter you will be able to expose properly outdoors in daylight and keep your F stop wide and get some amazing shallow depth of field with creamy bokah. I find the images they create to be more cinematic and they create beautiful bokah. They look less digital.
I'm currently shooting with the GH2 with the flow motion hack installed on a short film entitled "Insomniac". I love this camera not only for the resolution but because of the old Canon FD glass I can use with it. The old glass has a filmic quality with which match very well to the GH2's sensor. I think some of the newer lenses that are available for the GH2 are more digitally sharpened then I like personally.