I showed this to my brother. He was not impressed.
"Smarter" is a bit of an Americanism, "cleverer" should be accepted here too.
We use US English, so it’s quite obvious that it’s an ”Americanism”, but of course synonyms should be accepted. We had more clever, now cleverer is accepted as well.
Jag är Mycroft Holmes
... men inte blygsammare än honom.
I don't remember seeing mig before. When is mig used instead of min?
Never. "Mig" is "me", object pronoun. "Min" is "my" or "mine", for possessives.