Obviously you have not used a Sony with the newer Z battery. I get all day on my Sony battery, FF mirrorless. Actively Shoot 1200 shots during a game, with IBS and lens OS running and still have over 50% battery remaining, seriously over 50%. Add a grip and now you have 2 batteries I could shoot for days. This is not an exaggeration, it is reality. I am not a Sony fanboy, I just moved where the technology that meets my needs is. I will always have s soft spot for Canon, my first SLR was a T-50, its where I learned about photography. Kind of why I still come to this site. I want to see what Canon does next.You nailed it. This is exactly what I tell people why I still prefer DSLRs for wildlife shooting.