View it this way, its always a comparison. You have to see what gear he is currently using. Sometimes its good but it does not mean its good enough. Good enough as compared with his existing gear and good enough for the way it is being used.
Just to give you an example, many say that the Nikkor 17-35 f/2.8 is as great as primes (and it is). But I did not get rid of my 24mm. Because, it is still "a little" sharper, the distortion control is better and most importantly I have a habbit of visualising and shooting with 24mm.