Quick update (and PSA).
I finally bought the Ryet K1 instead of OdinZeus, just to compare with @aeroskiii feedback.
The weight is ~52.5 g, which is below the 58 g in the spec, great (?).
But the saddle rails are a full 1 mm smaller in both width and height (!)

I measured ~5.5 mm x 7.5 mm vs. the specified 6.5 mm x 8.5 mm.
This makes it impossible to use in any of my two road bikes, as both of my seat posts use 1 bolt type of clamp for oval carbon rails (7 mm x 9 mm) or regular 7 mm x 7 mm.
Probably same outcome even if the rails where on spec., but wanted to let you all know

Anyway, time to look for a round seat post with a 2 bolt type clamp, usual suspect is the Elita One 63D: this one clamps the rails from the top/bottom, so I hope it works for such undersized rails. The other seat post is (proprietary) aero shaped so I am out of luck for that one anyway

Cheers!