Does Mjolnir being magic effect the outcome of Superman vs Thor

Does it matter to an certain extent

Yes, Thor dies in microseconds instead of picosecond

An ass [1] statue holds either a normal or a magical hammer -- makes no difference at all.

[1] https://en.wikipedia.org/wiki/%C3%86sir#Etymology

Are you asking if a magic hammer would make more difference than a regular hammer lol ?

Well as Thor's striking feats with Mjolnir are due to the strength of his arm, it shouldn't matter if he's holding Mjolnir or an adamantium hammer,no?

Check one of the many Thor vs Supes threads for the answer. We don't need a thread every time you have a question.