Having multiple inputs supporting HDCP 2.2 could definitely be a useful feature. I also see that it has 9 channels of amplification as opposed to 7 on the 1060. That could be useful if you are looking to run a 2.0 stereo setup in another room.
For sure, getting a model in the same line as your existing one should make it much easier to get to grips with quickly which can be a big plus. Having recently swapped from a Yamaha receiver to a Denon I found the Denon initial setup to be a bit of a nightmare! Although in my case I am not running a typical 7.1 so it was always going to be a bit more difficult than plug it all in and away you go.
As for last years model and who would want one - me pretty much every time! All of the high-end receivers I have bought were purely down to the fact that they were last years model and deeply discounted. As long as there are no hardware related features like HDMI 2.0a / HDCP 2.2 / Atmos / DTS X where you need to have a receiver have it built in, so to speak - the year on year upgrades that most receivers receive tend to be minor "features" that not everyone will use. In my case last years model had the important features like Atmos / DTS:X / HDCP 2.2 & HDMI 2.0a but was significantly reduced from the RRP that you tend to have to pay at product launch.
I'm not saying that the new ones are not improved, generally they are with some exceptions. However if you can get a 1060 for £350 vs a 1070 for £600+ I don't think I could be convinced to pay the extra for a 1070 with what I would expect to be very little sonic improvement. Obviously if you do need multiple HDCP 2.2 inputs right now then fair enough - that could make the 1060 a non-starter.
However if you weren't so tied to Sony something like a Denon X4200W is likely to give you way more bang-for-your-buck than the 1070:
DENON AVRX4200WBlack Atmos AV Receiver
Still has HDCP 2.2 for 8 inputs and 3 outputs, also has 9 channels of amplification and supports Atmos and DTS X too. The Sony 1070 seems to be a circa £500 receiver. The AVR X4200W is a £1k+ receiver. It should therefore be an improvement sonically on the Sony 1070.
Not trying to push you into the Denon at all. All receivers do sound slightly different - I can't get on with Pioneer's with my current speakers for instance. You might really like the Sony "sound" compared to other manufacturers. However, value for money wise I would always recommend people buy something like a receiver when it is discounted if possible assuming it DOES have the features which are mandatory for your setup. After all, receivers typically only last 5 years (or less) before something new has come out they aren't compatible with anyway!
Just my thoughts
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Actually, it seems like a lot of the deals for last year's models are disappearing now as I am sure a lot of the stock gets snapped up quickly.
Anyway, let us know how you get on with the Sony once it arrives. I heard a demo of a Sony 1040 a while back and have to admit I was pretty impressed with it!!