I most certainly am, my only quibble is that I found a tiny bit of softness on the right hand side of a couple of images. Could be a slight miss alignment of the adapter, but I need to shoot some more to be sure.
Also my adapter is a cheap Kaavie brand and it's got a thumb screw to hold the tripod foot in place and it keeps getting loose. I'm just gonna superglue it when I get a moment.
Apart from that all is good. I took some lenses, A7r, 5D2 and some fuji kit away on holiday.
For the dawn/dusk patrol I used the A7r, for the shots of my daughter knocking down my sandcastles i used the fuji. and the canon errrr nothing. I'm very new to the A7r so took the 5D2 as backup and something I know how to operate. I didn't feel the need to use it at all.