This is not normal. I would exchange the unit.

Yes, through the USB port on the back of the tv.

Yes it will according to the Sony help line. Great 4K tv too with good price.

Yes

This television can be mounted to a wall.

Absolutely. I mounted my Sony 43 LED 4k on a flat wall mount that slides side to side.

Yes need. Bracket w/ VESA 300x300mm

Yes

There is a button for Channel Guide and it works very well.

If you are on antenna then it does have a basic guide that comes on your digital signal. Otherwise on cable you need a box for info

I have the worse cable on the planet, and the channel guide on this TV still works with it.

Yeah, it's got at least one, and I think actually two composite inputs.

Yes it has analog inputs on the back so you can hook up a VCR or old gaming consoles, etc.

I have owned a samsung 51 inch 3d tv from a 3 years ago and I liked its interface more than sony.

I have the the sony 4k tv now and I like how easy it is to use, but I found samsung to be more user friendly and attractive to look it.

I don't know what the hub for a samsung model is like, but there is a "Home" button, which will switch you to a dashboard where you can select the Android TV app(like Youtube, Hulu, netflix) as well as the other HDMI inputs. (Is this the hub you are asking about?)

Switching to these apps are simple and straightforward.

I have used a slightly older Samsung (about 1 to 2 years old at this point.) The Samsung webapps are way too slow, and seem awkward to use. But it is the slowness that really bothers me. I am not sure if this is improved in later years. The Best Buy salesman was telling me that some TVs have duel to quad core processors, but I am not sure how accurate that information was. If you look at the Samsung in person, see if you can "click around" the Samsung to see if it is slow to load.

The Sony I have to say is phenomenal with their webapps. I didn't buy this TV for that feature, and just think of it as a gimmick. Now that I own the Sony, I use these all the time. I ended up actually getting a subscription to Netflix just because it is so easy and fun to use on the Sony. (and the picture quality is excellent, but the Samsung is probably equivalent in quality.)

The Sony does have a hub type functionality as well.

There is a smart hub, same as the Samsung model. It's simple to navigate from the home menu, with all the streaming services and other apps all easy to locate. There is also a Netflix button on the remote, one click and it takes you to your Netflix account