Not sure where to begin. Primarily a birder using Canon but bought my wife an A7 earlier this year and we're expanding the lens collection and adding a Sigma 150-600 C with M11. I would like to lighten my gear if possible. So much variety of configuration with Sony. I will be reading ALOT.
You'll be disappointed shooting the 150-600 on the Sony. I have the 150-600 sport and I normally use it on the Canon. I have used it on the Sony, but the AF is slow and can struggle quite a bit. I think with standard lenses there is a definite size benefit to the Sony, and it tends to perform fine with adapted lenses, but with a slow supertelephoto . . . . . . . .










