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My experience with sonos is that they sound quite harsh and confused at higher volumes and more so with complex music. Not sure I'd want them as part of a home cinema system. With sonos you are paying for generally seamless operation and ease of use/scalability, not SQ.
Perfectly fine for background music or for filling smaller rooms in the house though.
If you watch a lot of films at home, go for a proper surround system. Centre channel speaker, and a good tuneable sub are critical.
For my money I'd still spend it all on a high quality stereo system though.
If you have money. Go sonos. Grab the cheap play 1's for each room that you don't care about steteo in, then spend some moulah on a playbar and two play 1s for the full surround sound in your cinema room. You can even add a sub if you want deep and dirty bass rumbles.
Then, there is a nice upgrade path too, as you can buy more play 1s to make stereo pairs in your other rooms, or replace one of them with a play 3 or 5 if you want.