I thought I was the only one, actually I don't need sunglasses and I'm fine with the EVF in daylight but not in low light.
I have a Panasonic G1 and it's light output is fantastic. Even when adjusted for best effect I just can't use it in low light. I've only tried one other CSC, a Nex 6, and it was exactly the same.
Frankly, I just know how any human can use these cameras in low light.
If they could fix this problem and up the DR of the EVF I'd happily move fully to CSC.
Sadly and frustratingly this is something that I've never seen mentioned in any review.