The opinions from experience of real photographers like Kenspo are worth more than most tests you'll ever read, there are a few Pentaxians that I absorb the opinions of and in time I usually agree with them.
I traded my K1 in for a K1 II, not for any deficiency reason (it is a superb camera IMO) but for the areas of evolutionary improvement stated by Ricoh in their marketing. I'm not competent enough to test and give hard facts and figures on how much better (or not) the new version may be, but from my couple of weeks of shooting I would share the view that high ISO is at least 1 stop better and the Autofocus seems quicker to lock-on to subjects. I don't think we're going to be able to definitively prove that Birds in Flight shots will be captured n% more often with the MkII for some time, and even high ISO comparisons are a bit subjective (the images are manipulated/smoothed/pre-processed by the camera) so the "look" may not be to the taste of everyone.
The K1 II is an evolution not a revolution (a favourite phrase often applicable to Pentax) and it is not time for everyone to ditch their first generation models, just do it if you want to
p.s. When I say "Real Photographers" I am not trying to run anyone down - I'm just talking about people who do it professionally, semi-professionally, and the like who have a lot of everyday experience in the field - Not like me who takes several thousand images of averageness and below per year