Surround sound for music.

I find the Sonos One sound quality for music lacking which is why I also have stereo paired HomePods in the living room just for music. They sound amazing. They also replaced a set of Kef LS50W wireless in the living room which are huge bang for the buck even at $2500.
I had Sonos ones in stereo pair in the bedroom and replaced those with Homepods too and it is so much better.
We will see how it sounds when I get the sub but I'm also still going to get sound out of the beam which I don't want when playing music.

I find Sonos Ones ok for background music especially when trueplay tuned. I have several single Play:1s around house (like dining room etc. where it just fills the room with sound I'm not there for any major listening) In my opinion they do sound very good for critical listening when stereo paired with a Sonos Sub and Trueplay tuned. Kind of the perfect combo at that point. I think your going to find Pair of Sonos Ones and sub will totally blow away paired homepods. Maybe more for how good the Sonos Sub is.

I don't find the Beam in the mix with Play:1s bad. It takes away the true stereo and makes it more of a surround - but really fills a room. The Beam to me is just on the "bright" side when it comes to a little much high end on music. Playbar in the mix with Play:1s and sub gives a richer sound.

I'm sure I won't find that at all.
Two rear Sonos Ones with a front Beam and sub aren't going to sound nearly as good as two stereo paired HomePods which is also a much cheaper combination. Not that cost is much of a factor for me.
I thought it was odd that the Beam still plays when I want music in stereo and did a search to find out that people have been asking for years for Sonos to fix this. If you could disconnect the soundbar and do Trueplay for the sub and rear speakers it might sound passable to me. Even then the rears would probably have to be Play 5's and I don't find the Play 5 matches the HomePod for sound quality. I've seen lots of other people say that and many who sold their Play 5's for HomePods.
Prior to the HomePod the cheapest speakers I used for music were the Kef LS50w so I'm used to very good sound quality.
I've heard the sub extensively with paired Play 1's and Play 5's. I know Sonos people think the sub is something great but it's just OK. A $500 SVS sub among many others is far better. The Sonos sub lacks detail and is boomy which you can only control a little bit. I'm just making the trade off to get wireless for HT.
Nothing Sonos makes competes with stereo paired Homepods for music. The HomePod is much more sophisticated technically and has a full rich 360 sound Sonos cannot match with any of their current products. They are also auto-tuning. Plus it's a smart speaker too and I switched from Alexa to Siri for privacy reasons. Siri doesn't come close to Alexa functionality but it does everything I need and I find it to be more reliable.
The only reason I have Sonos is for home theater. I've done the Yamaha high end receiver with 9.2 and dual subwoofers and decided to simplify and get rid of all the wires.
I think alot of Sonos people are justifying their purchase and/or haven't heard anything better since most people seem to do bluetooth speakers for music.

Well then I will stop giving you opinion since I must be used to Bluetooth speakers and not all my B&W seperates and sub.

Interesting that you assumed I was talking about you personally.