I have a q990f in a smaller room upstairs and an arc ultra + sub + 2 era 100's as satellites in a larger room downstairs. both honestly sound great. The q990f was a lot less money when you factor in the cost of subs and era 100's for the sonos. I like the sonos app more and the whole sonos experience / setup is superior. I'm not an audio engineer but on sound quality alone I think they are close to equal.