I do own Pentax 67II and in my opinion it offers one of the best designed MLU function. If you have a metering prism (which is fantastic by the way) activating MLU activates exposition lock. So, you don't need to think about hardware, you can focus on the scene.
Originally Posted by Poisson Du Jour
And this beast can be operated handheld withoud MLU and you still can get razor sharp pictures. This one was shoot with 105 mm lens and 1/60s (no MLU of course):