I've said all along when you want a player that the selling club doesn't want to sell and the selling club has the leverage of a long term contract, you are going to have to pay a premium to get it done. The same applies to Antony. If you're going to get him, it will be for €70m-€80m and not for €60m.
I love Martinez and he'll definitely bring agressiveness to your side. I don't agree he breaks down under pressure. Sometimes he simply refuses to take risks, other times he will stay ice cold when players are chasing him down. Most defenders who are calm on the ball, tend to miscalculate every now and then and then make a big mistake. I actually don't recall these with Martinez. I think he's really found a solid balace in staying calm and resisting pressure and deciding when he shouldn't take risks.
On the other side he does have a few weaknesses. I wouldn't call him slow, but he's not the quickest. Sometimes he takes stupid yellow cards by being aggressive at the wrong time (half way line tackles) and obviously he is not very tall. Nevertheless he's strong in the air for a player his height. But put him against Lukaku/Zlatan types obviously he's going to struggle with crosses.
But guess what, that's why he's a €40-50m player and not an €80-100m player. PL fans should really stop acting like €50m is a lot of money for players they don't know that well, whilst accepting ridiculous fees for PL players. Martinez is better than Mings or Dier, but they would probably be regarded cheap for €50m. Saying €50m is expensive is BS as long as ridiculous fees are paid for average PL players. Harry Maguire being the biggest example for that and £80m Harry is going to be benched for this €50m guy now, unless EtH switches to a back three (which I don't think is likely).