Anecdata: Some artists I've known told me they bought a Mac because when they went to the store, and when they asked what they should look for/get they were told "Artists use Macs", so they said ok, not because they wanted it, but told that's what they should use.
Anecdata: everyone on the film set in 2009 except for the studio accountant used a Mac, and the accountant was a Thinkpad Guy.
Anecdata: Some artists I've known told me they bought a Mac because when they went to the store, and when they asked what they should look for/get they were told "Artists use Macs", so they said ok, not because they wanted it, but told that's what they should use.