You're going to dislike this answer, but here I go anyway: Only you can answer your question. The specs and measurements will be a helpful tool in aiding you, but you really need to hear them for yourself to make a fully informed decision. My preference may be the complete opposite of yours, so I don't recommend listening to someone else's opinion on this one, as it's just subjective (many things are at play here, such as bias, personal tastes and the listening room).
Do you think you'd be able to sell the RF-3's for what you paid if you don't like them? If so then buy them and compare them to your RF-2's; it's the only way to be sure.