That's a funny comparison between the Alexa and an RX100m5. (!) Res is not what makes the Arri so great but hey... we're comparing apples to mangos. I'm not going to give up my Nikon D4 (or D800) and favorite lenses like the 85mm/f.14, but those are never in my pocket. And I don't carry my RX100 around either because that's a PITA.... my phone is typically the camera that's always with me by default and I would much rather shoot a portrait with the computational "bokeh" mode than otherwise. But of course that's just a matter of taste and I respect your opinion. :)
RE: Mobile Portrait Photography Will Never Be the Same Again