I really enjoyed the Voigtlander 25mm when I used it. Excellent low light, unparalleled sharpness, it was an amazing lens. But overall, something about vintage primes and other not so sharp modern lenses like the Sigma 30mm 1.4 keep me coming back for more. They just give the GH2 such a unique look that I can't ignore. While the VL will give you the sharpest, cleanest image possible on the GH2, which is what almost everyone wants, it may not have the "character" that older Nikkors, Rokkors, Takumars, Jupiters and other off brands give you. It's totally personal preference.
Although if you asked me to choose a lens to permanently weld onto my mount... it would probably have to be the Voigtlander 17.5mm or the 25mm; since they do perform the best all things considered.
Although if you asked me to choose a lens to permanently weld onto my mount... it would probably have to be the Voigtlander 17.5mm or the 25mm; since they do perform the best all things considered.