Mc-11 on A7... Help

The adapter works with both contrast and pdaf but pdaf is significantly faster. Saying this, I also have an mc-11 and it is relatively slow with my Canon 100-400, but also keep in mind this adapter is specifically designed for Sigma brand EF lenses, so it doesn't guarantee that Canon lenses will work

 

Or a new camera body?  

I agree with the other comments as I had a similar experience with the Techart/DEO TA-GA3 adapter for Contax G glass. I used it for a while with an A6000. It did kind of work, but was slow, glitchy and would occasionally cause the camera to freeze up. When I bought my A7ii, it was like night and day. It works almost as well as the Techart Pro, though much noisier.

 

I have the MC-11 but on the A7Rii body. Works well with Sigma Art lenses (Canon mount), and also the few Canon lenses that I've tried - Canon 70-200/2.8 non IS, Canon 50 STM and Canon 40 STM.

 

Also, if you don't mind manual focus and aperture rings, there are a lot of older lenses that work nicely with very cheap adapters, and are themselves very inexpensive. (Some old glass is quite expensive, though.) Opinions vary among those here as to which lenses are best bang-for-buck with acceptable IQ, as you might expect. And of course it depends on what you like and your subject matter.

Look through Adapted Lens Sample Image Showcase for sample pics.

 

My partner at work bought the MC11 for his A72, and uses it with his Canon glass. Some of the older glass has some issues, being slow to focus, but it works. No issues with his newer Canon glass, both L and STM.
Only the old Canon 85mm continues to plague him.
He like the L lenses, which the 85mm is.