Having owned an E46 an E92 and now a C63, I will say this.
I should have kept my E46. It was a full spec low mileage FSH example in carbon black with ACS3 suspension, exhaust, intake and map.
It would have been my weekend toy.
I wouldn't buy another E92, they are very nice to look at and incredible to drive hard but I just never gelled with mine. V8 too muted, needed high revs for any performance, seating position too high, and somehow it never felt special.
I must admit there was a gap of 3 years before I got the C63 and apart from the narrow rear end and tyres I love it.
It's not hooligan, but that start-up noise is lovely (E46 cold start? but with bite and intention).
You can drive it around like an every day C class and wonder why those in the know are looking.
If you want some noise and performance without breaking the law you can have it in Sport and enjoy the pops and higher rev gear changes, but if you really want to rag it then you can have it in Sport+ or manual.
The HK sound is decent, the satnav is quite good.
The squeaks and rattles are similar to what you would have experienced with the E46 (except on a younger car).
Steering feel is probably on a par with the E92 but it seems to be very sensitive to suspension set up, air pressure etc. (19" wheels).
Mine has the LSD which does the E46 type 'grinding' when cold but is excellent when 'driving with the rear'.
It does feel heavy and especially will for you coming out of an E46.
I had the use of a Porsche 911 C4s 991 (current model) after I had already bought the C63 and that is a total licence losing hooligan.
It is the slightly grown up brother of the E46 if you are looking for something similar.
It looks beautiful, but is not as fast as you would think, it handles fantastically and the driving position is spot on.
But it is too noisy and uncomfortable for every day use.
I would love to have one,---but not instead of my C63.
There is no other car I would like to have as a daily driver at this moment than my C63 and when I get tired of mine I will park it and keep it for occasional use.