Redmist

I've never ridden the 650 on the roads so it'd be difficult to compare.

However, it will depend what you want from the bike.

Inner city commuting? I wouldn't recommend it after my brief experience so far.
The Sv1000 likes to stretch its legs really, in town it feels quite lumpy and stifled, especially low down the rev range.
Although on the brand new rubber, it feels agile and I don't notice the weight until I'm man-handling it into the shed or up n down the drive. The extra weight does seem to help it hold the road well, especially on the bumpy country roads that surround me.

On the open road, it'll make you giggle like a school girl and all in all it really has a great character to it.
You know you've ridden it that's for sure!

If you want a satisfying, good all rounder for sunday scratching, eating roads for touring and maybe the odd trackday, I think it will tick all those boxes for me eventually. For the right price you wouldn't find much else to compare.

If in doubt try finding a dealer willing to let you test one.