Good morning.
I disagree in some points with this article.
In my opinion FF and APS-C are different tools and both have their pros and cons. But coming from film I miss wideangles without too much distortion. Sorry... That's FF . Same thing for 31mm and 43 mm : on APSC they have a character but that's not their nature. But, for sure, If I take pics of my son doing sports of course I like the crop factor when using teles (and that's why I will NEVER sell my trusted and beloved k5). The same for macro. But I would like using a T/S or a 24 with the FOV they are intended to(ok..no many T/S in pentax right now,,,).
Then, just another consideration
eople coming from film camera sistem(just like me) years ago had to choose between APS-C and FF considering a really huge difference in price... and many didn't had the possibility to afford the price of a FF body even if they would like to buy it(I used Canon gear, I wasn't a Canon loyal fan and Eos 5d II-III was really expensive and over priced). Now the time has come people can choose between APS-C and FF spending quite the same amount of money for a camera body...that's good for all of us!!!!!
I was considering to buy a Sony a7 II when Pentax FF was announced . Now I'm very happy I could invest in a Pentax FF that will be my second camera and use lenses like they were intended in the film days. A 20 mm on FF would be a real wideangle and there would be no need to go to 10-20 mm zooms for APS-C. But that's the way I see things, many would differ and I respect them all!
Best regards.
Matteo