For me it was off camera lighting.... It takes away all the excuses. Gave me a massive interest in portraiture ive never had before. People like to see the images of themselves lit properly..
You also get better results from lesser / slower lenses..!!

I think I could manage an hour or two at an event like this...No matter if my Pentax camera can do sports or not....lol

I would certainly give it the thumbs up. I installed one into my system when i built it 3 years ago and have never regretted it. I use the SSD as the program holder if you like and a large capacity normal drive for storage... The benefits are far speedier boot up times.. Less noise from moving parts in a normal disk drive. Less prone to failure though not bullet proof...

Probably was a bit drastic, I agree. But in the great scheme of things. it wasnt just about wide angle lens options. But with more third party lens manufacturers willing to back it. The Nikon D810 is looking a better all around overall proposition.
Just a couple of full frame examples...
Pentax...15 - 30mm £1439. Tamron 15 - 30mm £829 (based on SRS prices).
Pentax 70 - 200mm £1549. Tamron 70 - 200mm £1099.
I agree Pentax use different lens coatings. But have yet to see it reviewed as a massive improvement worth a third as much again. So bang goes any saving that was made on the body.

And im not going into the Pentax off camera flash system....

But having said all of that and sounding a bit downbeat... in forty years Ive never owned a brand other than Pentax. so its back to the drawing board..

Thanks for all the info and help guys... Its left me totally confused as what I need to do... So much so. Ive cancelled my K1 order. (Many thanks to Doug at SRS) ..

I was considering the Tamron 17-50 ,,,Sorry is that an apsc lens ...I thought all Tamron lenses were full frame compatible... Im being to lose the plot..If at all I ever had it...

Though I dont do much landscape work. The point of the filter size on the Irix and Samyang lenses had not gone unnoticed..

For now I can certainly rule out the 15-30.. As for me its far too expensive. Better look up the boy scouting classes...lol I was considering the Tamron 17-50 as at first glance its reasonably wide at the wide end and fairly fast throughout. Anyone use this lens at all ?

Thanks both Johns... Something to think about there.. Though non auto focus lenses arnt much use as you regularly dont get to raise the veiwfinder to the eye and have to use a lot of guesswork... Interesting point on using APSC lenses in the full frame mode.. Is there a listing anywhere as to how much vignetting eacl lens actually produces ?

well that is good news...!!