Thank you Herra!
I like stall speed as an aggregate measure of a number of factors when the plane is in flight at critical angle. I can predict that in a 4 G turn it will reach stall at 2x stall speed if piloted perfectly. And I think the neat part is that would be 2x clean stall or 2x dirty stall depending on configuration.
Of course piloting can change that but never for the better.
One thing though. In the turn where the smaller wing version of our plane is experiencing higher drag and slowing down at a greater rate, the very act of slowing down does tend to reduce turn radius so there's some ratio of lost lift widening the turn to lost speed tightening the turn, the path is not simply the rate so in my view...
If both start -above- corner speed then for a time the ratio might benefit the higher wing loaded variant. And I think that's where high speed turn performance maybe delivers a bit more.
As you say, it gets complicated.
IMO the place the higher wingload plane will get the biggest advantage is combining high speed and the vertical. That's where the FW's have been best for me.