The Pentax MX-1, Fuji X-Pro1 etc... are far from what j dog was looking for that is Nikkormat/FE2 digital. Take the Leica M9 and it's the digital version of the M7. But take the pentax MX-1, no it's far from the digital version of the MX or the Olympus OM-D is far from the OM-1/2/3/4 etc..
First and least important that they have smaller sensor than the film version.
They don't have a reflex viewfinder.
They don't have the same controls, the pentax MX was only manual exposure and manual focus the MX-1 is auto focus, multi exposure modes and the controls are located at different places.
They only look similar.
If you compare the Leica M7 and M9 you will see that they have the same viewfinder, same rangefinder for manual focus, same shutter speed dial and same aperture priority plus manual. The light meter are also the same. The M9 doesn't have additional metering mode like spot or evaluative. And that's where the value of the implementation.