Are you comparing the new 650 with the old , or the 1000 with the old 650?
Well, both actually.
The 650 has way more power than the NT.
It has a shorter wheel base which makes it handle quicker, but it isn't as stable as the NT
It is almost 100# lighter.
The lighter weight and chain drive make it more responsive than the NT
Both the NT and Versys are fairly tall bikes (and my Russel Day Long raised my NT seat about 1")
The NT has better brakes.
The NT has better wind/rain protection.
The Versys is more fun - the NT is more comfortable.
The NT gets about 5 more mpg than the Versys.
But I like the looks of the new 1000
I'd like the 120 hp too - maybe too much.
The hard bags look small, but they have to work better than the NTs.
And since I prefer tall bikes it might just fit me.
I plan to keep my NT. It just plain works so well for me.
It is comfortable AND it is paid for!!!!!