I don't own a RE20 so I can't say for sure and of course it's a bit personal. But I lusted for a RE20 ever since working with an ADR supervisor who swore by them. You can have people scream into them and still get a good take. Anyway in my long and winding quest I came across the PR40. It has most of the same characteristics of the RE20 but a number of folks liked the mid-low mid better, found it cleaner and less muddy. I tried one out and really liked it so I own one but as I said I haven't personally done an A/B with the RE20. RE20 is a bit sexier looking though...
SK