Will the X10 replace my 5DII?
No - it's a 5DII - nothings going to replace the 5DII until the 5DIII comes out
Will I carry the 5DII less often?
Hmmmmmm :shrug:
Sure - there are circumstances the DSLR is a necessity. But if I'm only looking to print to A3, then when would the X10 prove inadequate?
If I'm driving around and stumble on something special (mists at dawn, etc) then I'm not going to be grieving that the only camera I have with me is the X10; it will do me proud.
The conclusion of my weekend playing with the X10 is that it and I are going to get along just fine.
Next time I go out with the X10, we won't be playing.