By far, and having tried just about every universal IEM there is, I can wholeheartedly recommend you the Ortofon EQ-5 for neutrality, transparency, and the likeness to full-size cans.
Honestly, the only IEM I regret selling was the EQ-5, and it truly shined at what it did.
It was the perfect balance of neutrality and engaging, while maintaining a massive sound-stage with pinpoint instrumental positioning.
Vocals are unearthly real.
I liked them as much or more than...