Hey Juu, I agree the DR is probably the biggest drawback - RAW is a must to get usable highlights.
Also, after almost a month and a half of waiting I finally received the 7-14mm, and it is a great lens, nice build and fit with the gf1 (haven't posted anything online yet).
Came looking for this thread to post a couple from yesterday. I managed to score a broken sigma APO 400mm f5.6 (k mount) for $10 yesterday! The AF is broken, and the contacts are not communicating the aperture, but the aperture ring works fine (though it looks as the f5.6 isn't quite f5.6) and the lens still focuses manually (the glass is excellent, but the body is beat to crap - I think whoever owned it hung it from their pack for a decade or so). They also must have ruined the AF by turning the focus with the mechanism engaged, because the screw for the AF motor looks like they took a drill bit to it. Anyway, took these with the GF1, so posting here; not bad for $10 and a first attempt (all at f5.6):
Edit: Finally got the links right! Oh, and monopod was used for all the shots - handheld at 800mm equivalent is pretty much a no-go, too wobbly to frame the subject!