Yes looks a good lens. As an owner of a 100-400 II , previously a 150-500 Sigma, currently 300 II 2.8 and 600 F4 II, as good as the zoom lens are, there is a noticeable quality difference when you go for the big primes. They are just so sharp. Its why they can charge so much for them.
But you can still do great things with a lens like that 60-600mm . It's an amazing zoom lens range. Very useful.