Last season we went out and got the 3 or 4 players we needed and improved by 20 odd points and won the C .......oh why do I bother?
Exactly, we improved by 20 pts after we spent 200m on 3-4 players. We need to improve by probably 3-4 points to win the title and that would have been 1 top player, 2 would have been a dream.
Coming back to your post, City improved their weak spots, ie, cover for Fernandinho. Yes they have lost Kompany but he missed half of their games and they bought a left back to make sure Laporte plays as CB and also bought a right back as Pep was not very happy with Walker. If Pep thought Kompany was vital, he would have kept him, it's not like City needed to sell, he went on a free.
For the rest it's not that important as our target should be to win the league, ie beating City. However, Spurs has definitely improved and so has United, Lukaku leaving is not a big problem as Ole doesn't seem to fancy him. Their defence is much better. Arsenal could probably have the best attack of the league though their defence is questionable. As I said, we shouldn't even be looking the other teams, our focus should be City and relative to them we went backwards.