From an extensive HomePod review
"Tl;Dr:Later in the review:
I am speechless. The HomePod actually sounds better than the KEF X300A. If you’re new to the Audiophile world, KEF is a very well respected and much loved speaker company. I actually deleted my very first measurements and re-checked everything because they were so good, I thought I’d made an error. Apple has managed to extract peak performance from a pint sized speaker, a feat that deserves a standing ovation. The HomePod is 100% an Audiophile grade Speaker."
"Speaking of inputs, you have one choice: AirPlay. which means, unless you’re steeped in the apple ecosystem, it’s really hard to recommend this thing. If you are, it’s a no brainer, whether you’re an audiophile or not. If you have an existing sound system that’s far beyond the capabilities of a HomePod (say, an Atmos setup) then grab a few for the other rooms around the house (Kitchen, bedroom, etc). It’s also a great replacement for a small 2-speaker bookshelf system that sits atop your desk in the study, for example. When this tiny unobtrusive speakers sound so good, and are so versatile, grabbing a few of these to scatter around the house so you can enjoy some great audio in other rooms isn’t a bad move — provided you’re already part of the Apple Ecosystem."Apple HomePod - The Audiophile Perspective + Measurements! : audiophile