I had to realize this too late. As a wedding film maker, we always get sucked in by certain "marketing gimmicks". Things like "Auto focusing", "Cheapest Full frame", "High ISO" and "blah blah blah processor" are stuff that we usually fall for. These stuff really hooked me into buying the latest video DSLR every year and really ate up costs. It also lead me to devote more time studying them and every new gear I got.
Now that I'm trying to produce a short film it seems none of the cameras I bought seemed to have met my needs. That's because I never got the time to write a script. Now, I'm devoting more time into learning how to write a good story/concept and focus more on content than "features".
Oh as for 4k, it actually helped me a lot of times in terms of cropping and composing some shots for some of my corporate work. I still deliver out in full HD due to the fact that my highest resolution outputs are for web. A lot people here in our country still use DVDs in Standard definition to watch their weddings and everytime I try to convince them for a free upgrade to a USB, they still prefer the DVD. My point is, they don't care about "image quality", they just want to see their wedding with friends and family.