To get us back on topic a bit...
I've been on the French TGV, German ICE, Japanese Shinkansen (just returned from a three week trip in Japan, all by train), Italian Frecciarossa, Eurostar and the Austrian RailJet.
I think the RailJet is definitely my favorite. Not as fast as the others but the scenery between Zurich and Innsbruck just can't be beat. Even more fun if you stop off at the
Aqua Dome on the way.