Car appreciation... the aesthetics, the engineering, etc

Not really.

Assuming the E63 comes with summer-specific / more slick tyres so it would be a good idea to have winter tyres.

Yours will definitely have come with 'all-season' tyres which work across the year.

There are really only two reasons to get winter tyres:

1. You live in Russia / Canada / etc and winter genuinely requires snow chains etc
   
2. You have summer-specific semi-slick/increased contact patch tyres