I think experience with Best Buys and such really varies. I will say since I needed some help with installation, I elected to go with them this time, and the people who helped unpack and set me up couldn't have been nicer or more professional. But I don't think our local store even had a Z9F to view - I had to get a brief view of it in a 24-hour NYC store (and there wasn't really anyone around to help change demos, etc.).
Re reviewers, possibly an unpopular opinion, but I don't think they do a bad job in general and are giving their honest takes on these TV's. I like Vincent as well as RTINGS, but I think it's important to realize a lot of it comes down to *opinions* on certain things (like the X-Wide viewing layer not being worth the changes to contrast, for example) as well as a relatively short period of time with each setup. Heck, it's taken me *weeks* to dial in settings and get where I'm finally fairly happy with them and just enjoying my content, and I disagree with certain reviewer conclusions (for example, I learned I really don't like X-tended Dynamic Range for SDR, even though it's often suggested). Neither review for the Z9F was bad, but people hear what they want to hear (both pro and anti). Because the F has fewer zones and less contrast in benchmark situations than the D, even though it's much brighter, has wide viewing angles, has better input lag, has a very fast processor, etc., people unfortunately tend to focus on that aspect of it because of the relation to its predecessor, even though people who own it are quite pleased in actual usage situations.
Because of those perfect blacks, OLED's are going appear punchier at first glance. It takes more time and nuanced viewing to detect the stuff you're *not* seeing on OLED in the shadows. I also have a theory the auto-brightness-limiting of OLED's allows for brighter aspects of dark-to-medium-scenes without eye-searing bright scenes ever happening, even though that also unbalances the picture and makes it much less accurate. (IE, if a game has a bright white menu screen, you can run a brighter equivalent setting on an OLED than you could as comfortably on an LCD, because OLED dims down the brightest screens since it can't handle them, whereas you're gonna get ACTUAL brightness on LCD, so for comfy viewing, might need to take the general brightness down to a more comfortable level).
Personally, having come from OLED, I'm noticing a lot more shadow detail that I was missing before, and the whites are much brighter even though certain aspects of the picture I've had to get used to for being not quite as bright (to get to a comfortable overall viewing level). I feel like I can see EVERYTHING now though. Not having to worry about burn-in has been wonderful, and HDR is so much better on the OLED I finally feel like I'm experiencing actual HDR for the first time. (I tried to watch HDR on the OLED for quite some time, but always ended up disappointed and eventually stopped viewing HDR content most of the time; it was just miserably dim.)
Overall, I've got to agree. I think this is one of, if not the best, all-around LCD TV on the market, and I'm happy with my purchase. I do worry we're heading into a time, as some reviewers seem to indicate, where all the high-end TV's are OLED, and from my previous burn-in experiences, that's pretty upsetting to me.