Although Tony Northrup tends to be sympatheitic to Pentax, his video criticism totally missed on several points.
Reasons for FF: One reason for Pentax going full frame is that there were so many users clamoring. My own reason had to do with my full-frame film lens collection, which I impatiently wanted to use, especially the wider angle ones that became telescoped to inconvenient lengths (unlike many, I find the range between 35-60mm an uninteresting dead zone.) And the large number of good, compatible vintage glass was a sort of selling point for the brand. Apparently along with many others, with the release of the K-1, I feel that Pentax/Ricoh has kept faith. TN's discussion totally missed this: the K-1, with its low price and exceptional feature set, was an arguably important marketing device, not just for new users, but for veterans who were getting ready to bail for lack of FF (there have been a few here).
In the meantime, I've picked up several APS bodies which I've come to enjoy, especially given the flexibility of digital post-processing. I joke that I could take a photo with the bottom of a beer bottle and make it come out ok with enough work. But over time, I've come to understand and respect APS-C as a serious format in its own right, and though I'm still looking forward to getting a K-1, it's now mostly to run wide angle primes and shift lenses. The image improvement that the larger sensor will provide is now more of a matter of curiosity than necessity.
No Lens Availability: Because you can develop a familiarity with a single focal length in a way that is too confusing for zooms, I prefer shooting primes when possible. In this regard, there are plenty of vintage lenses available, belying the criticism that lenses are unavailable for the K-1. My own experience with vintage lenses is that there are a good number of primes that provide high quality images on 20 MP K-S2, which is in some ways more demanding of spatial resolution than the K-1. TN's criticism of lens supply mistakenly ignores the availability older glass. Zooms, of course, are another story. Since aspherical elements and exotic glasses are now commonplace, the quality of modern zooms is unmatched by earlier versions.
Pentax also has a unique reputation for compactness, not only in its prime lenses, but in camera bodies as well. Pentax crop-sensor camera bodies are already relatively compact, but the main bulk in a camera bag has to do with the lens complement. For travelling, the larger size of the K-1 and its lenses is a disadvantage, especially if you use zooms, but it is possible to assemble a kit of small primes, limiteds and vintage, which are less bulky than other brands even in FF. However, while I've been toying with the idea of going to M43 for trips, I'm finding that I can do well with a couple of crop bodies with a 15mm/f4 limited and a 50mm/2.8 A macro, and with a 135mm/2.5 in the bag. A mix of new and old that I doubt TN would have considered.
Divided Resources: The camera is planned for a four year lifetime, which leaves resources for further development of APS-C, as we're seeing with the K-70. Pentax still needs to improve focusing, and tweak its sensor performance. The D500 has set new standards, which Ricoh will be matching as technology improves. (Movies also, for whomever is interested). But I'm thinking there will be APS-C advances over those next 4 years, which will not only increase performance of the newer crop of crop cameras (couldn't resist
), but will likely be incorporated in next-generation FF. And will we see the FF tilt screen on the next APS-C flagship? Instead of spreading resources too thin, I see the possibility for developmental synergy. I think TN missed that too.
TN just isn't Pentaxian.