Originally posted by JimmyDranox I respectfully disagree. Yes, Sony 24 Mp is not a very good sensor for a future camera. We don't know what Sony has in their plans, but certainly, Pentax engineers has such informations much sooner than us,and they can their plans (if they didn't made it already by now). Would be somehow strange for Sony to make new, and better sensor of 42 and 12Mp, and let a big gap between.
Anyway, the future will set this dispute.
The 24 megapixel sensor is pretty old. The 20.8 megapixel sensor in the D5 is probably the answer to your question, as it has really good high iso and really good read out speed and is capable of 4K video. The only problem is using that sensor probably would jump the price of the K-1 by over a thousand dollars.
In this market place, you usually get what you pay for. And if you use an old, somewhat out dated sensor, you will have a cheap, but soon out dated camera. That is probably fine for some Pentaxians, but not necessarily a hit in the market place, unless you can figure out how to get a full (and cheap as well) lens line up and undercut 6D and D610 prices. I doubt that Pentax would sell enough cameras to allow their price to go that low.
Originally posted by Dan Rentea Video for me is not important, but high ISO is needed in a lot of scenarious: astrophotography, wildlife, weedings, sport, etc.
At ISO 8000 my 6D files are quite usable (see the image below).
https://s32.postimg.org/wf9ug7xlh/codros.jpg
Canon 6D was sold very well and still is because it has: great high ISO, wifi, GPS, better dynamic range than 5D Mark III and it can focus down to -3ev with the center point af.
K1 has a lot more features than 6D at a reasonable price and this could be a good reason to buy it. But it also depends on where you live. Unfortunately, in Romania K1 will not have big sales because almost no one knows about Pentax. The oficial Pentax store is sleeping (no marketing, no Facebook page, no possibilities to rent lenses, no local service, etc.). Not to mention that K1 is quite expensive for enthusiastic photographers around here (K1 is sold for 2200$ while 6D is sold for 1360$).
So, a new Pentax full frame priced between K-3 Mark II and K-1 (with 22-26mp and 7fps) will probably sell very well.
There are definitely places where a K-1 is sold for better prices and others where it isn't. Kunzite is right when he says that the 6D is pretty old, the K-1 is about the newest full frame on the market and has some features that aren't present in any other full frames. In the US, where I am, the K-1 comes in at a price that is between the D610 and the D750, which is probably about right.
My comments on the 6D were mainly that it doesn't bring anything to the marketplace that other full frames don't as well, except a cheap price. The same is true of the D610 in the Nikon camp. If folks could buy a 5D MK III or a D810 for the same price as the 6D and D610, there wouldn't be any question about which most folks would opt for.