A fairly prolonged listening session tonight didn't yield any super strong conclusions, but the ICON did OK.
One very good thing was that I could immediately tell on the ICON when I'd accidentally chosen a "High" (FLAC) album instead of a "Max" ("HiRes" FLAC) and when I switched, the jump in fidelity was plain to hear. Now that's probably no different to the same circumstance with any streamer, but it was a nice bit of positive reinforcement that a few weeks with TIDAL has trained my ears.
I listened to a variety of stuff by Pink Floyd, Coldplay, Tift Merritt, Foo Fighters, Nick Drake, The Egg, Norah Jones, Dire Straits, The Cardigans, Jim Hall and Howlin' Wolf. I'd usually listen to three or four tracks on one streamer before flipping to the other. One instant thing I could tell was that the fixed volume limit on the WiiM is higher than the ICON, so that immediately created a false impression in the WiiM's favour.
Honestly, a number of tracks were pretty much a dead heat to my ears, and it was only outlying sections of certain tracks where I could really hear the upsides of the ICON. Coldplay's Warning Sign has a piano section where the bassier lows were far more clearly presented on the ICON, whereas the Mini seemed a little fuzzy. At the other end of the spectrum, some rat-a-tat cymbal work on Number Cruncher by The Egg was also more clearly delivered by the Bluesound box - you could really appreciate the crispness as opposed to the more tinny blur of the WiiM.
White Limo by Foo Fighters is a favourite test track of mine as it's a curiously melodic racket where the density of much of the track can descend into chaos. The WiiM deals with it well, but the ICON seemed to cope even better, adding some organisation and separation, but not in a clinical way.
Early days and really a product costing 10x the price of the WiiM Mini bloody well should sound better. It does and I'm pleased (and relieved!) but I need more time to tune myself into it to get a real feel for it. Hopefully over the course of the week when the kids are at school I can have some good speaker time with it. On BluOS - I don't like how the Search function compares to the WiiM interface, and I also prefer the layout of the track being played on the WiiM app over the BluOS. They're minor, easy-to-fix UI issues - basic layout stuff that really should be obvious.