There have been a few mentions of the IE800's in this thread and so I thought that it would be good to share a few thoughts on how they compare to the R2A's.
After a few years of experimentation (see my profile for the full list) I settled on the IE800's as end game IEMs for me. Despite the usual complaints about cable length etc. they ticked every possible box in terms of frequency response and sound quality. Sadly, I sold them due to car funding issues (grrr) with the goal of re-buying a pair once funds allowed.
In the meantime, on the strength of an R2A recommendation on the IE800 thread I took a chance on the R2A's, allowing me to compare from memory and hoping that they may remove the need to buy the much more expensive IE800's again.
I took the splitter off immediately (safe to do, easily reversible for anyone concerned about theirs) and am using the R2A's with Martin Logan Mikros 70 silicon tips. These provided the best fit and sound of the various ones that I had to hand and tuned the response a little nearer to my taste (I like treble and found the Complys too veiled). I haven't had imbalance or end seal issues as far as I can tell and have been pleasantly surprised at the quality of the sound, although it has taken a period of adjustment for me. My initial feelings were of delight with the bass but disappointment at the lack of any sparkle. The change of tips, combined with just getting used to the different presentation has left me much happier with the R2A's. As mentioned by many, the super compact size is extremely comfortable and so they are the first pair of IEMs that I have worn while falling asleep. Overall comfort is excellent and I get a consistent dependable fit each time. The only more comfortable IEMs that I have owned would be the Klipsch X10s which I continue to keep specifically for their extreme comfort.
So how do they compare with the IE800's? It turns out that it is too close to call from memory alone, however I believe the differences to be:
Bass - The IE800 and R2A both have superb bass with great presence, but not to the point where it feels exaggerated. Bass on the IE800's works better on public transport or noisy environments.
Mids - I prefer the more recessed mids and u-shaped frequency curve of the IE800's.
Treble - This is where the IE800's really stand out with a much more vibrant, present and sparkly treble. Despite the improvements that silicon tips bring to the R2A, the treble just doesn't compare.
I fully acknowledge that this is very much a measure of how each model meets my audio taste only and not a fundamental strength or weakness of either.
I believe that on balance I prefer the IE800, but I really need to hear the two side by side again to be sure. To that end, I have bought another pair of IE800's and will be able to re-compare and report back next week.
Whatever happens with the IE800's, I think that the R2A's are excellent IEMs and extraordinary VfM at KS price - I will be keeping them either way!