Nothing felt better than the Mora Companion , Mora #711, or a Bahco 2449.
I have had the BRKT Bravo 1 and 2 and the Aurora.
Bit too slick for my taste, though the roundings felt nice in the hand.
The Esee 3 handle ,feels too flat/thin en too short.
The ESEE 6 feels like holding a 2x4.
The ESEE 5 feels like holding a brick.
Of all the ESEE's the Izula II and the Junglas, felt most comfortable.
Though the Junglas has a bit too wide handle for my taste.
Higher price is not per se equal to better product.
So oval handle is ideal for me, not round though.
A little flatness at the sides is good or at least ok in a folder, but there should not be any sharp edges/corners on a knifehandle .
In a folder I like the handle, and blade, of the CS Talwar 4 inch.
Nice curved handle, but the CS Espada(medium, larger is not allowed here in the Netherlands) just felt a little too curved in the hand.
The handle of the CS Voyager Large I also like a lot.Actually the best of the CS folders. Nicely rounded and hand filling.
No agressive finger grooves .
When one needs to do some cutting with effort, one immediatly notices the importance of good handle ergonomics.