Best speaker for vocals

What are opinions on a speaker that is known for its midrange?

Quad esl 57
Harbeth
ATC

are all well known for midrange quality.

I want the most realistic vocals. I have read that Harbeth Super HL5 may be the ticket but it is not full range and there is no matching center.

The large Quad's are hardly practical for HT and lack the dynamics so IMHO you should definitely check out ATC. Many of the movies that you buy (Hollywood productions) will have been done on ATC's anyway. The ATC midrange is roughly 30 years old but it is still in demand by clients in world class new facilities. The fact they buy a thirty-something year-old midrange design speaks volumes.

I would add that "best" is still very much a matter of taste and some like ATC and some don't. So make sure you audition.

The new Klipsch Palladium p37F look very interesting

Maybe merlin's monitors or floor standers could fit your requirements;excellant speakers.
Also a used pair of dunlavy scIII's,IV's, or V's might work.
Last what about a different amp;like a moscode hr401 (hybrid)?

Dali Helicons sound really great with vocals, no listening fatigue with the ribbon tweeters.

Any speaker made by Von Schweikert is great on vocals but also huge soundstage, pristine non-fatiguing highs and tight, powerful bass; integration of drivers mimics the ideal single driver point source. Go hear them if you get the chance.