Gintaras, I cannot say anything about 1plus2 yet as I have not heard them. Thanks for raising my interest, though. I will definitely check them out soon.
1. How can I trust you when you haven't even heard the SD-3? Seriously.
2. You are assuming the SD3 sounds worse because 1plus2 costs more. Congratulations!
The whole design of the StageDiver series is to get superior sound quality (that usually costs you 1K $$$ as a CIEM) for a lot less. To put them in the same category as most 500 $ IEMs is just wrong, because that is definitely not where they belong from my experience.
Eke, i had a chance to listen to a few pretty good IEMs like AKG3003, higher line from FAD (thanks to James444) and also have TF10, H200, RDB+v1 and heard a few more including Senns famous IE800. excuse me pal but 1plus2 comes on top of all of them for me personally. there is simply no race. the only two that could seriously challenge 1plus2 were AKG3003 and IE800.
I have written a detailed comparison between IE800 and SD3. I wanted to become a fan of the IE800 but next to SD3 it was not possible, even though I am not a fan of the warmth. SD3 is technically superior by the most objective perspective I can take on. Maybe you should give them a try first before writing other IEMs "play in another league".
If Mimouille says so, I will not argue. I trust him.
But I am not okay with you jumping to that conclusion without any fundament or argumentation other than price difference. It's not helping anybody.