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You are correct, the grind is similar but the left one (x-thick Spartacus) is longer than the middle one (Crown Wing) and therefore it has quite a bit more heft to it. I would say the Spartacus has...

Maybe these images will help - from left to right is an x-thick, a 1/4 hollow and a 1/2 hollow.

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I find it noticeably heavier than my TI 1/4 hollow, but much closer to 1/4 hollow than to a vintage wedge.

The premium scales on those razors accounts for a substantial part of the cost, you can...

I have one of these and it is a thicker grind than my 1/4 hollow TI Crown Wing, but nowhere near a wedge.