Surely you wouldn't pre-order one until you had convinced yourself it was better than OLED? That format has to be the pinnacle of design surely with each pixel individually lit (or not).
The LG B7 and C7, at 65" cost £4.5k so £1.4k more expensive than this. That's nearly 50% more than the cost of Q7. Whilst I am not denying that Self-emitting technology is potentially superior, is it really worth 'that' much more. It won't offer the same level of brightness (especially not if you want to keep colour accuracy) and whilst 'contrast ratio' is 'technically' higher - its a mathematical thing - it possibly also won't offer as wide a colour gamut. The Q series offers over 100% of the DCI-P3 gamut. Viewing angles could well be similar too.
Going back to the Contrast Ratio, this is calculated by taking the peak brightness and dividing by the black level and any number divided by 0 gives infinity. The OLEDs could have a maximum Peak Brightness of 100nits (SDR level) and still give a greater contrast level than any HDR10 accredited LED. The fact is though, that at the black level, an OLED may have 0.00nits but these LEDs offer around 0.03nits - that's only a very 'small' difference. At the other end though, you have around 700nits of Peak Brightness in an OLED compared to 1500+nits - a much greater difference - even with the logarithmic nature.
Of course there is no chance of un-even black bars, haloing, bloom, bleed etc with an OLED - even FALD TV's can't eliminate Haloing. I have the KS8000 and don't have any of these issues with SDR content. With HDR, I will admit that black bars aren't 'perfect' but they aren't 'distracting' and 'darker' than my H6400 is with SDR content. I actually had to go back and check, paying particular attention to the bars as I hadn't noticed any unevenness because the content was so spectacular. Haloing was far more apparent BUT only evident on defined bright objects, like text/logo's, on solid black backgrounds. By defined I mean objects with sharp edges. This really only rears its 'ugly' head on things like end-credits. Whilst it is there and quite obvious, its not a game changer for me or 'bad', I don't tend to watch these anyway but I won't lie about the fact it occurs.
I recently completed Horizon:ZD (PS4 Pro) and played that entirely in HDR. As its 16:9, there is no black bars and not once did I see any 'light' based issues. I can say the same for games like Ratchet and Clank, Gears of War 4 etc. I can't say for definite on Infamous, Uncharted 4 etc as I haven't replayed these in their entirety since I got my PS4 Pro and/or the HDR update. Having access to HDR via Youtube on the inbuilt App, I have watched every HDR Channels videos and 90%+ have no light issues at all. The LG demo's look incredible - until the LG Logo appears at the end and then I get some haloing around that but the majority have no discernible issues at all.
Point I am making is that just because these are 'edge-lit', doesn't mean they can't deliver an (almost - if blacks were 0.00nits) perfect SDR experience with no light issues, an excellent HDR experience with very minor occurrences of haloing and slight un-evenness in black bars (if you notice these) but if you own a LED TV for SDR content, then chances are you get some unevenness to black bars and minor haloing anyway and these are no worse in HDR. Of course you can turn the backlight down a few levels and reduce (if not eradicate) these issues - you may not be getting 1500nits anymore but you could still be getting more than 700nits...
Of course its not going to happen with an OLED - it really depends if that as well as the other differences (like lower peak brightness etc) are worth the extra £1.4k+ to the person buying or not.
I am not trying to say that someone should buy a 'specific' model or technology but its often not as 'black and white' as it may seem. It really depends on the individual, their budget, what they want from a TV, what sources they use and content they watch. If HDR is a 'once a month' type thing, then maybe the Q series will be more than adequate. Maybe if you can spend £4.5k the B7/C7 OLEDs will be better for that person...