Empty, the two have wing loadings of around 32 psf. I'd expect the corner speed of the 20 to be lower - and so think Floob is probably correct.
While it may seem counterintuitve that any twin could turn with "the best fighter of the war"
, it isn't, at least unladen, any surprise to me.
Wait 'til we get the Beauwy... It's got an even lower wingloading and lower speed. That one will be a bear at low alts and speeds - and will likely soak up snapshots like a fat girl soaks up... anything you'd care to mention.