"Proportioned" is a fairly loaded term. From the side, the ratio of length to height is close to the real-steel / real-polymer guns, although both are a bit larger.
The one that's likely closest to the real-steel size is the CM.121 Desert Eagle.
It's the width where they diverge: they're all necessarily and noticeably thicc in the gripp because of the gearboxes.
That said, I have stubby fingers but can trigger a CM.123 without any problems. Aesthetically, it's not ideal, but functionally it's fine.
If you require 1:1 then none of them will really do. If you want a usable low powered pistol (with upgrade potential) then any of them will work.