I have been watching your thread to see what's coming up, but since noone seems to have an answer I will chime in with my experience.
I've been building my collection over the past years and besides other people, Crinacle's information has been very helpful.
www.crinacle.com
His ranking table lists the Empire Ears Phantom as specifically good for male vocals and the frequency response of that IEM confirms my recommendation I'd give based on my own collection, the Astell & Kern T8iE (MKII).
For male vocals it seems to be better to have less of a "Pinna Gain" boost around the 2-4kHz range, and the T8iE combines that with excellent clarity and detail. Bass is boosted, but subjectively I find it much less boosted than the frequency response makes it look like. It's not in any way overshadowing the midrange, just gives a clear and warmer foundation.
Another IEM that comes to mind, but one I have only heard briefly, would be the classic Campfire Andromeda.
In either case I'd consider buying used. T8iE should be available around €/$500.
Other IEMs that might fit your need are the Sony IER M7 and M9 models but I'd read about them, I don't have enough time with them to say more than that the M9 really stood out of a a bunch of IEMs I tested.
Edit:
Spent a little time to give Pavarotti a listen through my 2 daily drivers and as expected the T8iE is the better choice, bringing the vocals out more clearly and more foreward. Due to the excellent soundstage of the T8iE the voices are still not up close and intimate, but that is how they are recorded.
I suppose the EE Phantom or the JH Roxeanne that Crincale mentions might be even more focused on the lower mids, but the T8iE is doing a beautiful job as well, and if the voice is foreward in the recording, it also comes out like that with a touch of warmth, great clarity, detail and free of harshness.
At half the price the FD02 is good too but does not have the level of clarity, transparency or soundstage, and is a bit smoothed over.