Well, this is where it gets a bit tricky. Both myself & Twin think the SW3 is . . . in a word Phenomenal - having many aspects that come very close to $1000+ IEM's
Personally I find the IT03 to be a Very good hybrid monitor, coming in at the top of its class
In terms of preference. The SW3 is warmer, more fun, in some ways less analytical but with an amazing 3D holographic soundstage. The It03 I find to be on the other scale
of this. They are both highly recommended but which you prefer will come down to
a, which type of sound you like
b, buying an older version of the SW3
The tricky thing is that some people here seem to have a later production model of the SW3 which is giving some sibilance issues. Not sure precisely why
Personally I find the SW3 to be an end game iem for me. I have NO burning desire to upgrade from the sound they give. I can appreciate that there are 'better' sounding
items out there but I think way beyond my budget to beat the SW3!
Anyway, to answer your question... No, the it03 does not match the sub bass depth or soundstage of the SW3 BUT this doesn't mean in any way that the IT03 is lacking either!