I love the Hornet, myself, it's the IL4 SV

Basic, fun, more than the sum of its parts. I'd've had one if it weren't for price considerations- though I don't regret that, to be fair.
The big differences are going to be the power and the handling... No getting around the fact that you're way down in power with the SV- though IMO what power the SV has is delivered better than the Hornet. If you enjoy the top end of the Hornet, not so good. If you're annoyed by the flatness of the Hornet when you're not cracking on, then that could work out.
The handling's different... I'm not going to say better or worse, I prefer the SV but the SV's flickable while the Hornet's chuckable. With a 160 rear, there's not an awful lot in it. Hornet seemed to have better suspension from what I remember, though that was ages back.