I have cases from Luvitt, Spigen, Ringke, Maxboost, Caseology and a couple others and while you're right the Samsung is not 100% clear, it is hands down the best thin fit case. There's not even a close second. I'd bet most people who weren't very familiar with the S8 would swear it didn't have case on it if you handed it them.
I've yet to find a hard clear case I like. Either the edges are sharp, they feel cheap or the button covers don't feel right. BTW - Not what you're looking for but the Luvitt TPU is the best in that category.