Anyone test fly both the JS3 and the Ventus 3?

You can't really compare the V3 Sport cockpit with the V2a cockpit, they are completely different. Besides being a different fuselage altogether than the 2a, the pilot seating position has also been adjusted in the V3 Sport.

The pilot is rotated downward with butt further forward such that the shoulders are now positioned further back and at the widest part of the cockpit. The rudder pedals also have more adjustment allowing for a larger range of pilot heights.

It is still not a large cockpit like a 27, but probably similar to the LS8 and certainly larger than the old "a" cockpit.

Then, there is still the option of the larger V3 Performance cockpit with the forward hinged canopy and larger instrument panel.