I found the answer in a report. It is "yes" only the size and price distinguish the 5200 from the 6200.

I mean, the 6200 also has a better resolution.

I had the 5000 and 6000 before and now only the 5200. As far as I can tell, the only difference is the size. In other words: The 5200 has everything you need. The 6200 is too big in my opinion (mounted on the windscreen it takes away visibility (could cause problems in case of an accident), mounted on the radio it is in front of the ventilation, mounted next to the gearstick there is conflict with the passenger's knee (despite the big car, VW Touareg). The only disadvantage: POIs such as restaurants and petrol stations :-) can finally be loaded but not displayed acoustically. Otherwise: unconditional recommendation.