SQ is subjective, loudness by ear is also somewhat subjective. I find a that your average enthusiast has a problem distinguishing between low bass and loud bass and more often than not will choose the latter. It's like those who can't distinguish between Loudness and SPL (Drag comps)
Not saying anyone here is 'average'. Of course the alignment is near top priority. Stick the Sundown in a .60 cu ft sealed enclosure (if it could fit) and you stuck the 13W7 into a perfect alignment then the JL will come out on top. All things being relatively equal however, which more or less what i did with the W6v3 and SA-12, and the SA was a clear and streaks ahead winner over the JL. But of course that's my experience.
For me budget is important and I see know reason to pay more money for less performance on all subjective fronts. You might have a JL fanboy that will disagree, but I'm not a fanboy for anything other than my wallet and getting the most for as little outlay as possible ... and on that level, again, JL simply does not cut the mustard.
The W7 is a nice driver, i'm not here to say it's not. But for me the few 12 W7's that i have experienced just left me thinking ...
meh. Someone else might latch onto and scream that it's the best thing since sliced bread. For me it was an average to less than average performer. If one think the W7 is where it's at, I would suggest getting out more. Now conversely I've never tried the 8W7 ... but it's still on my
'buy & try before I die' list