No, it's not. I had the S10 leather case and it was a joke. The S20 leather seemed a LITTLE better?That is not very encouraging.
Honestly, these phones are so fragile I'm putting mine in a Tech21 Evo Check, or something of the sort. I had my S20 in a Cyrill Color Brick with a Whitestone dome protector, seemed durable enough. One drop shattered the screen.