Sorry Scott, I'm talking about 600mm PRIME lens NOT the tele zooms -
although those 2 you have are splendid lenses -I did have the Sigma 150-600mm Sports lens some years back when
Sony had the
A mount system- they have updated to E and FE mount now Mirrorless= I also have a tele zoom the Sony 200-600mm f6.3 which I do often use as its a very portable lens, when I walk about without a tripod + I love the fact that the zoom from 200-600mm is internal and the lens does not extend when zooming, very useful
Seen here on one of my Sony a7Riv bodies
Les