It seems that Norev has got licences of all Mercedes models, while AUTOart just got a few. Although Norev still can't produce models as detailed as AUTOart, it is an option with reasonable prices anyway. Actually, I'm waiting for some S-class models such as W220 and W221, hoping Norev will build them soon.
There is no interest for any new ABS plastic models by autoart including AMG GT. Autoart should continue producingthe diecast models otherwise I don't think the quality of plastic AMG GT is more stisfiying than norev diecast one.