Revel f52 vs B&W n803 or 803s?

Trying to get a handle on the differences to make a used purchase. Haven't been able to compare side by side. Heard the f52, sounded very nice, clean, clear, with deep bass, but maybe a bit boomy bass? I'm a long time fan of B&W, having older 803's, but haven't heard the n803 in a while. What are your impressions of either, and has anyone compared both side by side?