I think the Tyros5 does an excellent job with the European organ simulation/emulation, and to a much lesser extent, so does my Tyros4 (even though I have the 1 gig upgrade and some good third party samples), but as far as replicating the Hammond B-3, both instruments fall a bit short, in my opinion, of course.

For the amount of Hammond-ish sounds I use, the Tyros4's sim does a very reasonable job, but, if I was playing a lot of Jazz or Rock organ tunes, I'd probably want to add a dedicated clonewheel to my kit, my first choice being a Hammond XK3c. Having had the luxury of being able to A/B the XK3c to the Hammond B-3 I play at the jam sessions, the former's sound is exceptionally accurate, and the keybed/keyfeel is, for all intents and purposes, identical to the real deal (allowing for wear and tear on the B-3).

When I played the Tyros4 as a tonewheel organ, it worked okay, but when I played my friend DMAC's XK3c, I found myself playing licks I used to play on my old B-3 back in the band days...the keyboard/keybed feels that natural...it's hard to describe, but those here who play a Hammond (or a really good clonewheel) will understand...there are techniques that seem to be only possible on the type of action used on a B-3.

Even playing my Tyros4's drawbar organ sim from an XK3c midi'd to it, improves the organ playing experience on the former dramatically, so, key action, again in my opinion, does play a major role in the Hammond sound, and, at least as far as I can tell, is not as crucial for the European organs.

Ian