For amateur filmmakers: If this is within your budget, go for it. You will love it. If the cost here is too much then I think you would also be very happy with Sony's a6000.
For professional filmmakers: If you care about dynamic range like I do, this is it. Sure it has room for improvement but it gives me amazing video in a small package that is also extremely fast and enjoyable to work with.
For amateur photographers: If you have the budget and you want a camera with lots of manual focus lens options that will give you tons of bokeh, dynamic range and low light sensitivity then you will love this. But you will likely also be happy with many other cameras.
For professional photographers: It makes a superb second camera because it's so different from your DSLR. For example, you suddenly have the ability to shoot handheld with nothing but moonlight or candlelight. - BUT, if this will be your main camera, there's a good chance you will come across some things that slow you down or annoy you.
A pro "tog" needs something that is fast to work with, has long battery life, has menus that make sense, etc. Most professional DSLRs would be a better stills option compared to this. The many software issues (read about that here), pointless limitations, slow usability, bad controls, messy menus, mediocre photography autofocus and constant warning messages might annoy you as a pro. However, I've spoken to quite a few photographers who use an A7 series camera without noticing the issues too much, so maybe I'm just a little spoiled by DSLRs.
There are a few other limitations that make it less than ideal for professional photographers. A lack of dual card slots means I could never use this as the main camera for wedding photography (dual card slots allow for an immediate backup, which is a must for weddings). The same thing applies to the A7, A7 Mark II and A7R cameras.
Almost all the other issues are software-based and could be fixed in a firmware update, but Sony don't seem to want to do that. There are small improvements in new camera releases (for example, slightly less software issues in the A7S compared to the A7) but there have been no big firmware updates to any of the cameras to address these issues.