I had been shooting with an MX for a very long time until this year, but gear acquisition syndrome took a small hold on me in January and February this year, and I wound up with an SL, a KM, and briefly using a borrowed Spottie.
I can't say it made any difference to my technique, obviously, or all that great a difference to my results, but several things really stood out with respect to usability.
To my surprise I preferred the matchneedle to the LEDs.
SP ~ KM > MX.
To my even greater surprise, I was blown away by the optical qualities of the normal Takumar lens.
SP > KM ~ MX.
To my lack of surprise at all, I preferred the bigger and looser shutter speed dial on the Spotties and the KM, and really appreciated the fact you could wind it around from 1 to B to 1000. SP ~ KM > MX.
The stop-down metering on the spottie was no big deal, most of the time I shoot in bright daylight. MX ~ KM >~~ SP
All three had DOF preview one way or another, but the MX/KM right-hand switch felt more natural than the lens-barrel left-hand Spottie/Takumar switch. I liked that it was dedicated on the KM rather than shared with the autotimer as on the Spottie. KM > MX > SP.
I never really used the auto-timer feature, but I appreciated the decidacted start button on the SP rather than the imprecise push of the timing crank on the MX and KM. SP > KM ~ MX.
I liked the availability of the exposure info in the viewfinder of the MX, and have never found it obtrusive. MX > SP ~ KM.
Some people have made a point about the different film wind feel on each of the three cameras, but, although it is noticeable, both in the lever shape and in the wind action, it's not something I attach preferences to.
But all this was nearly dominated by overall size, heft, and balance. Preference:
MX ~ Spottie >> KM.
And, very important, the big MX viewfinder was something I really missed in the others.
MX >> KM ~ SP.
And one last usability factor: the Spottie has a (left-hand) shutter on-off switch; the MX has a right-hand shutter lock that functions as a meter on-off switch; the KM has neither, and the shutter goes on/off with the lens cap. Right-hand>left hand. Overall, definitely, for the metering on-offness, MX > Spottie > KM.
Overall:
MX >~~ Spottie (with wistful awareness of missing something in each that's present in the other)
> KM.
Well, that's all, for what it's worth.
Sorry if instead of starting a new thread I should have put it into one of many already existing. I guess the thing is that I'm explicitly comparing three generations of cameras rather than two.
Last edited by asaru; 05-21-2011 at 01:36 PM.