I can’t see a difference? PC Tablets

I’m looking to buy a Tablet. I have narrowed it down to a Sony Xperia Z2 Tablet. however…
what’s the difference between the Z1, Z2 and Z?
I can’t see much of a difference. help?
Answer #1
There is no Z1 tablet I think, only Z and Z2. Z2 has a better screen technology (IPS vs TFT), a little faster processor and a little more RAM. Screen is worth the price difference imo.