the GH1 is fine for wedding photography, performance is good upto ISO 1600, it has controls that you can change quickly, the lenses are small enough that you can carry i2-3 in your spare hand, it has fast accurate autofocus, easy to use manual focus, great live view, various aspect ratios...
...... than mine!
Mine is rubbish at ISO1600 - in fact I can't print anything at a reasonable size (A3 and up) from an ISO800 file if there is any shadow in the image - the noise and banding is dreadful. My G1 is the same.
The autofocus is a joke in low light - especially if anything is moving, the only 2 fastish lenses are the 20mm and 45mm primes, and have you
really tried to manually focus a moving subject with a "legacy" fast (read shallow DOF) prime with
or without the magnified view?
My entry-level Canon 550D leaves it for dead in all these departments, so would the entry-level DSLRs from Nikon, Pentax and Sony. My 5DII and 1DIV are on a different planet in comparison. The range of inexpensive fast lenses is huge on the Canon and Nikon systems and almost non-existent on M4/3.
Nice little cameras ..... BUT !
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Judge: ' This image may be better in black and white - perhaps even just black! '