Mirrorless cameras have a number of advantages, the best being able to use most lens available with the use of a suitable adapter.
In an age where modern lens are getting closer to closer to being perfect when combined with software correction, sometimes people want a more unique look.
There is now a growing interest in older lens of character and a number of older designs have come back into production.
A company is now making an adapter to enable the use of Leica M mount lens on the mirrorless Hasselblad medium format camera. The results are striking and if you have a mirrorless Haselblad and some M glass you should really give it a try.