You'll find a good deal of feedback about the Evutec Karbon in various threads on this forum. The Karbon is made with Kevlar, and would likely be significantly more shock absorbent than the Apple case. Indeed, leather is not regarded as a good material to protect against shocks.
I personally love it! It's my go to case for the simple fact that's it's thin, scratch resistant, grippy, covers all four sides, the port openings are large enough to accept a lot of different types of headphones and lightning cables... And the carbon fiber look on it is awesome!
For that amount of material, it doesn't matter if it is Kevlar or Carbon Fiber. It is just a very thin superficial layer that doesn't add much structural integrity. It is there for aesthetics.
For anyone who hasn't handled one, it is just like a flexible TPU layer with a CF finish.
A thin veneer of high-tensile strength material, whether carbon or kevlar, does nothing for shock absorption, which is the primary task for a phone case. So yeah, it's for looks.
You're probably right; I haven't seen the case in person. Are you an engineer? (It's an honest question--I don't intend to be ironic or hostile.) Many case makers trumpet military drop certification, including Evutec's Karbon, which includes videos of drop tests. I imagine there's good reason to be wary of such claims.
Nope, not an engineer by degree (I didn't survive college-level engineering calculus or physics; and the classes were overwhelmingly male 😉), but I still think like one.
I took a cursory glance at the Mil-spec standard all the marketers like to cite, but it seems to be pretty broad. And, as with many government standards, there is no formal compliance testing; it's all self-certification. These companies can claim compliance, but without any sort of testing results, that's all they are, claims.
I've watched the Evutec videos; notice they don't show much; just a guy talking. Compare them to the video STM has for their Dux iPad cases.
Don't get me wrong, Evutec makes nice cases, but their marketing lays it on a little thick. The bottom line is that a thin layer of rubberized plastic can only do so much to protect a fragile piece of glass from impact. It's best just not to drop one's phone.