It does feel small and it is not balanced with an adapted L glass in front. It feels like I am shooting a 70-200 on a DSLR kind of scale. That may change as I use it more, I don't know. The acid test is how it handles when I am under pressure, how quickly I can get to things, or do I just give up and pick up my 5D4 again.
I am going to shoot this with my 5D4, as my 3rd camera, not my main.
The eye AF looks AMAZING for portraits. almost being able to shoot blind.