I don't know that much about Mercedes capability i.e. I know the level 3 approval is supremely limited i.e. only in a specific geo-fenced area in Nevada, only on limited access highway in traffic jam situations i.e. below 40 mph. That is a ridiculously limited use case scenario to claim level 3 driving. It's technically true, but does not equate to being able to drive anywhere 95% of the time with limited human intervention.
Tesla's current FSD, as I understand it, can drive anywhere most of the time, with no or little human intervention. As in, give directions from your driveway, and the car fully drives itself, making stops, starts, turns, lane changes, red lights, etc etc, with the caveat that the driver is required to pay attention and intervene any time necessary. But from the little bit that I've checked into it, the car sort of literally 95% completely drives itself.
I don't think Mercedes is remotely close to this level of full self driving. Key word, think. I haven't researched it but also not finding easy info on what Mercedes can do other than their super limited, certain section of geo-fenced Nevada only highway low speed traffic jam usage.
I'll dig in a bit more when I get time, as I'd like to know how close other manufactures are.
Take a look at the video I posted and see if you know of other cars that have that capability.