Let's get him in first and let both him and Sterling settle and then let's see how they compare to Coutinho.Hardly cut the mustard at Chelsea. He is an unproven player in this league and you're spending 50 million quid on him when you have a pretty strong and well balanced attacking 4 already. The ultimate big cocks signing we've been accustomed to by City. Coutinho is a more versatile player.
Coutinho is a decent player but is amongst a team of cloggers and hasn't enough about him to drive the rest on. He's on a par to Mata. Maybe when Sturridge recovers there will be a spark of inspiration in your team to drive on.
Right now Silva is head and shoulders above everyone else with Yaya just behind. Coutinho needs to get to their level - I'm not sure he is in the right environment to get there though.
Ps. Do we need DeBruyne - most definitely. We need quality depth. Once he's added our squad I'd near perfect (possible tweaks in fab and backup gk aside).