I'm not really sure what they believe they've gained from the 'update.' As to the images the original K-1 produces I've no issue at all; isn't it that that matters? I couldn't afford to swap systems every time a maker brings out a new camera, then to find its been over-hyped anyhow.
One point about the K-1ii that I wasn't aware of is that the pre-processor now bakes noise reduction into raw files. Wonder why they've done that? Given I like good raw files to work with that sounds like a good reason to stay with the K-1 v1 version after all. I'm not bothered with silly high ISOs or the new pixel shift either.

Don't discount using a prime as K-1 images can stand serious cropping.
See my squirrel photo here: https://www.pentaxuser.com/forum/topic/garden-visitor-this-afternoon-56410/p-0#comm_585710 along with the full uncropped version from which it was made further into that thread.

One I've used is:
http://www.stereoeye.jp/software/index_e.html

See it being used here:
https://www.youtube.com/watch?v=f75mop9swTI
https://www.youtube.com/watch?v=5wrxbE1LabU
Note: not sure I would trust the links given below them, use the author's site above.

Just had to put the mounted processed transparency as returned by the film processor into the viewer and hey presto, stereo! No remounting or other fiddling around required.
The Viewmaster system would have required purchasing their dedicated empty reels and mounting the pairs in those. The VM images are roughly the same size as 110 stock so the Pentax system potentially achieved higher quality, albeit a bit quirky due to the vertical format making it more suited to portraits rather than landscape scenes (which the VM system was mainly used for with a large range of reels to purchase dedicated to various cities and resorts globally.)

The plus point of the Pentax system is its convenience. Just the adapter screwed on to take both images simultaneously and an easy to use slide viewer. When it comes to using sliding rails to take two images, the subject may well be quite different in the two images. Certainly that would be the case in my flag image above.
There were some dedicated cameras that produced Viewmaster format stereo pairs on 35mm slide film but the Pentax solution was pretty clever as it didn't require anything beyond a SLR wit 50mm lens and the stereo adapter kit and the images contained on a single slide transparency.

The camera adapter splits the image into a stereo pair for a 35mm transparency and the viewer lets you look at them, in 3D. Similar theory to the Viewmaster system if you remember that.
A typical slide with a suitable subject appears like this:


Note the gap between flag mast and the yacht to the left of it.

Using 3D glasses and conversion software they can be made viewable digitally but that doesn't come close to viewing the slides in the dedicated viewer.

Given Ricoh Forum's circumstances and that there is a slight tie up between Pentax and Ricoh (so I've been informed ) couldn't they be offered a sub forum here? We are actually now Ricoh users, are we not?

Ah good! Some setting must have got thrown out and was overriding the exposures. Pleased it was nothing serious.

Different programs ave different methods!

Thank you both for looking. Yep, no 3 is in with the action.