If you don't have high expectations of a tablet, the A8 is the right choice. Like the Lenovo (8th place), the Samsung is perfectly adequate for surfing, shopping and watching films - and is even 70 euros cheaper. Shortcoming: It works faster, but has a slightly inferior display and less power.
New model, everything better? Not so! The Tab A8 is somewhat heavier and slower than its already not particularly nimble predecessor, the A7. The display is okay for this price range, but also has some weaknesses compared to the Tab A7. And the features are identical, apart from the better cameras...