There seems to be quite a number of people double dipping for the PS4 version. Mind if I ask why don't you just stick to the previous version you have? I mean, they're essentially the same thing(not including that PS3 lag of course). Just curious is all.
My Xbox 360 is old and hilariously loud. It's used only for Street Fighter so avoiding the switching of consoles helps (PS4 and Wii U take up my two HDMI ports) as does not having to pay the additional cost of an Xbox Live subscription I'm not using.
In addition to that, when it's the only game I really play it makes sense to move to where the player base is. Plus remote play in bed will be nice.
I'd have also bought it anyway without those excuses because I'm obsessed with it.
EDIT: And yes! The Share button was a major reason I wanted the port in the first place. I've bought an Elgato HD60 since it was announced though so it'll feel like a bit of a downgrade for capture, haha.
I'll also enjoy going through the trials and stuff again.