Compared to the Strix Impact/Sica, the shape of the Strix Impact II Moonlight White is quite different. Of course, it still is an ambidextrous mouse, but that is where most of the similarities end. The Strix Impact II Moonlight White is significantly longer, and the back flare and hump are notably absent. In fact, the Strix Impact II Moonlight White basically doesn't flare out at all and gets progressively wider towards the front instead. The hump extends across the entire width, being positioned slightly towards the back across the length, and slopes down gradually towards the back and front. The sides are slanted but mostly straight (not convex like on the G305/203/Pro), resulting in a slimmer grip width than the dimensions may suggest. The shape closest to the Strix Impact II Moonlight White I can think of would be the original Razer Krait from 2006. While clearly a departure from the Strix Impact/Strix design, the shape of the Strix Impact II Moonlight White works well and is fairly unique, although I personally dislike the slanted sides.
As for grip styles, I'd say the Strix Impact II Moonlight White is mostly suited for claw and fingertip grip. It's a medium-sized mouse with a moderately pronounced hump, so it should fit most hand sizes. For reference, my hands are 19 cm long and 10 cm wide, and I found the Strix Impact II Moonlight White very comfortable in claw grip.