Try to put a Pentax spot meter in your pocket by the way!
That's where I keep mine!
Hmm ... that may be why people keep asking me if I'm pleased to see them ...
Silliness aside, I personally am a staunch adherent of the Pentax Spotmeter. I use a Sekonic L-758D in situations where I want both spot and incident metering, and of course when I'm metering flash, but for just straight-out landscape shooting in medium or large format the Pentax Spotmeter really hits the spot (<-sorry about that one).
Why? Part of the reason is the meter's simplicity. No bells and whistles. It just does what it says on the label.
Another big one for me is comfort: the handle, trigger, and eyepiece are exactly in the right place for me. The L-758D, which also does spot metering with more features than I care to learn about, is an absolute dog to hold, aim, and trigger.
One more minor difference is that with the Sekonic, you hit the trigger and the reading is fixed, frozen. With the Pentax you can hold the trigger and sweep around the scene and the reading will follow. Not essential, but I find it nice and smooth that way.
One thing some people don't like about the Pentax is that it reads in EV, and you have to get the shutter speed and aperture off the dial. But if you think in zones that can actually be preferable. If you want direct shutter speed and aperture readings, then give the Pentax a pass.
Cheers!