I ride a similar bike to the GSX650F - an old Bandit 6. It's a comfty bike, with better touring ergos than an SV650, but to be really comfty touring on it I had to upgrade the seat and put on a better windscreen. (I still might lower the pegs.) And I do wish it were lighter and a little more fun in the twisties - not that it can't corner, but it is heavy, soft, and a little hard to handle at low speed.
If you're considering the 650F, the 1200 / 1250 Bandits /GSX models aren't much heavier and are apparently a lot more fun to ride.
If you wanted, as others have posted, you could try to make the same adjustments on your SV650. Other people have been known to tour on them.
To be honest, V-Strom 650's are pretty cool. I kinda wish I'd gone for one. The ergos are great, the power's OK, and they still corner OK especially for what they are. Also, Honda CBR F4i's have a really good reputation for comfort for a super-sport.
I think that no matter what you buy, you could expect to need a taller windscreen, a throttle rocker / cruise control device, a better seat and luggage for touring duty.
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