I am not impressed at all with the video samples on this review, from what I saw it does not even come close to DSLR HDvideo quality. I have seen way better sample videos from GH2 so maybe the reviewer used weird settings or YouTube messed up the quality? Though good tonalities tend to show even when you downsample videos. My personal opinion is... I have seen better video and photos from cheaper compact cameras.
Stefan Stuart Fletcher: One of my many buying mistakes was the Sigma 50 mm f/1.4. My copy suffers from distortion, incredibly soft corners wide open (on a full-frame, admittedly) and short-focusing. Perhaps I was just unlucky with the copy and the 5DII is a harsh task master on below-par lenses. What _is_ certain, however, is that the lens is huge and bulky. It looks outsize on a 5DII and a 7D. I can't imagine how ungainly it must be on a smaller body.
I think you really need to test this lens before spending money on it. You really must need its optical qualities, such as they are, if you're ready to tout this monster around.
I was about to buy this lence too but scipped it.After using a canon 50mm for a day, I noticed that the canon is very very soft and full of cromatic bleedings. Almost all the shots had a foggy feeling.The sigma was fairly sarper than the canon and with more contrast but still had all the issues as seen on the previus posts.
I ended up buying the sigma 30mm f/1.4 and I am amazed with it, sharper than ANY canon I have used, even wide open it delivers beautiful sharp photos. Only problem I have noticed is that tends to miss the focus point very often.
Maybe it is hard for the canon focus system to cooperate with the 1.4 especially under dim light conditions. I never had focus issues with any of my other 2.8 lenses so I am sure is the lens and not me.
A weird thing I noticed on the sigma 30mm 1.4, is that near the corners of my photos, the bokeh from small lights forms in triangles and not circles as it normallly happends to other lenses. It is not something bad, just a bit unkomon.