The Sixty2 doesn't completely remove the heat but it's much less noticable than on the 800. I Had one for a few weeks at one point while my 800 was getting repaired.
Most of the heat comes from the exhausts on the 800, which curl around near your knee. The Sixty2 doesn't have the same routing as others have mentioned, which seems to keep the heat lower down away from you.
That said... it's still an air cooled engine sat between your legs.
In the UK, any heat is usually welcome but if you must have the coolest running bike you can in your climate, no Ducati is for you. They all have the rear the cylinder pointing right at your crotch, and feel warmer because of it.
The gear you wear makes a big difference though. If I just wear jeans, I feel the heat much more, proper bike gear... much less of an issue.
Never an issue when moving, just occsasionally on hot summer days in traffic, but you've always got the option of hitting the kill switch while you wait.