I was checking out these videos yesterday, and found them pretty interesting. This Youtube user is comparing the patches found in the original Prophet 5 to the Arturia Prophet 5. Some of the patches are almost identical. While it's unfair to truly judge due to the sound quality Youtube offers (I'd love to see someone do this and upload it to SoundCloud), it does show that you could probably get away with certain plugs in mixes, especially for background sounds. It would also be interesting to compare these to the modern Prophet 08. While Arturia's plugins are of the most demanding CPU wise, they are among the best. Check out the videos and try to hear some differences yourself. Of course, don't get me wrong, I'd take real analog any day...