Like most people I started with the live singing through an SM58. It was reliable and you knew exactly what you'd get. I play mostly in a pretty loud electronic rock band, but started taking my vocals a lot more seriously as we progressed and got better equipment and bigger stages. Since then I've run through quite a variety of vocal mics, both dynamic, though more and more condensers. Always liked Shure build quality and the Beta-87A was a nice step-up for a while.
Then I got hold of the Neumann KM105 and the quality and ease of singing was a revelation. Often hardly needed much in the way of EQ. Problem was that mic just wouldn't reject feedback and was so fussy with monitor set ups. Even though we use IEM on bigger stages, we mostly like some stage monitors as well for the feel of volume. I think the KM105 probably is the end of your search if you play acoustically or with a quieter band. I really, really rate it.
But then after struggling with my KM105 and going back to the Shure Beta87 a live engineer recommended trying the new Shure KSM 9 HS - he felt it was very close to the KM105 but the feedback rejection was far superior and the slightly flatter response might suit my voice. So bought from Thomann. Don't have the stores round my area to try these out, so was bought more in hope than expectation.
Safe to say, the other review is spot on. The same sort of ease of singing as the very best condenser microphones, but able to handle insane SPL and stage volume without feedback. Far less fussy about monitor placement than the KM105. If you wanted to get ultra-fussy you'd say the Neumann is more 'airy' and the Shure more 'silky' but to most people they wouldn't sound vastly different - it's just a lot easier to use the KSM 9 HS (in hypercardioid mode) on loud stages and, personally, the Shure build quality looks a bit more rugged to me.
Oddly the KSM 9 HS looks a lot simpler than most of Shure's line-up. For their premiere live vocal microphone, it's not got the obvious bling factor of it's rivals, but it's quality is all in the build and sound.
Some people will find the pattern switch between Hyper-C and sub-C is a bit of a leap compared to the older KSM 9 Regular-C and Super-C and I've heard some people complain that you have to open the mic up to make the switch with no outside visible way of telling which pattern is active - but I feel that any external switching would make it too easy to knock live. YMMV.
But if you play loud, especially if you play an instrument and sing too, this is the best mic you can get.