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My question is, how good is MB A/C to start with? Not all factory A/C is very good.
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The car was designed in a cool, forested part of northern Europe. How good could it be?? Let a Texan or a Saudi design an auto A/C system and I think we'd see something!
The R4 is an old design compressor and was a workhorse for GM for many years..cooled a lot of big sedans down nicely in it's day....BUT....it's not a powerhouse by todays technology. Nevertheless the R4's performance is not the limiting factor with an R134a conversion on the w126. Generally it's thought that inefficiency in the heat transfer of the condensor is the bottleneck on our cars.
There's been a lot of peeing and moaning about alternative refrigerants on the forum recently. Wade through the debris (on search above), and decide.
I know what I'd do with your car (because I did it).