how is the fit for you with vega
and can you compare sound stage between it03 and vega
i think from what you worte above the vega is ranked way better than it03
I really havent used the IT03 since I got the vega. Fit for me with the vega is great and was part of the reason I actually went with the vega over say the andromeda. I had major fit issues with the it03, so I was looking for something small. The only potential issues I have with fit is that with the angled nozzles, I get a nice slightly deeper fit than I am used to with some others. This isnt bad, but its made it slightly difficult to find perfect fitting tips. I know foam is recommended, but I have never been able to get a good fit with foam and dont want to have to worry about tips that fall apart and need replacing. I tried spiral dots, and they had a bit too good of a seal that caused some pressure issues, and I have settled mostly on medium spiral dots, but due to my ears being slightly different sizes, I find one of them starts to feel kind of loose after longer listening sessions. Too bad there isnt an inbetween size between medium and large. Though these are all minor issues, and the fact that they are so small has made it really easy to listen to these for 3-4 hours a day or more, just have to do a bit of adjusting sometimes.
I would say soundstage is probably similar between them, with the it03 maybe feeling slightly wider (though that might also have been due to the fact that in order to get them comfortable, I had a ridiculous tip extension which moved them pretty far from my ears). The Vega is not the widest but has pretty good depth. Though due to the tech they use in the vega they are nice and detailed so imaging is good and you really get good separation between instruments and nothing gets lost. I would have to go back and really compare though to give you a better answer. As I said, its been a while since I listened to the it03.
Way better... hmm, I dunno, the it03 is very good for the price. The vega is definitely in a different league, but its all about diminishing returns here, so I dont know any real objective way to measure how much better it is. The sound is more detailed, though maybe with a bit less clarity, and just comes across as more coherent and more natural. Beyond that, i think its really down to preference of the sound signature. Though the vega has a sound signature that I really love, it manages to emphasize bass, and mids, and treble while still feeling balanced. The bass I think is one place most people talk about, and it can feel huge at times, but its never at the expense of the rest of the sound. The IT03 doesnt really go for that emphasis, except maybe in sub bass, and while still balanced, it definitely presents as more natural, and maybe a bit brighter.