Have a 500...thinking about a 600
So I've already got a 500 f/4. But I've been thinking about getting the Canon 600 f/4 in addition. The notion of 44% more pixels on the subject is tempting. Photographing in New Mexico often involves long distances to subjects (think Bosque del Apache). Moving from a 1.6 crop sensor to the 1.3 crop of the Mark III (which I've owned for a year) is influencing this decision. Any thoughts from BPN members? I'm particularly interested in input from people who own both lenses. Many thanks!