It doesn’t really matter what anyone else drinks - if you think your partner has a problem then you’re probably correct. If he does have an issue, then he’s not likely to admit it, and this level of drinking will become the norm. Which may be fine for a while, but his body will get used to that amount and he will feel like he needs more in stressful situations, which then starts a spiral which escalates.
I’m speaking as someone whose partner drinks at least two or three bottles of wine every night, but increasingly frequently more and more and more. I’ve long described him as a functional alcoholic, but his behaviour is moving towards non-functioning. He’s unpredictable, unproductive, smelly and miserable — unless he’s drinking. It’s hell on earth, I’m managing the whole house and am in therapy for his recent behaviour toward me after drinking binges for my own sanity. I am struggling to see any hope of a future and think I’m crazy for being here still. I constantly walk on eggshells whilst he’s in his own private hell of addiction. But there is nothing I can do now but leave, it’s all up to him to make any significant change.
If he genuinely doesn’t think that he has a problem then encourage him to slow down a little. Stopping entirely can be scary and a lot of pressure. Spend time together without drinking doing things you enjoy. Have a couple of nights off drink entirely every week. If he can’t do this then it’s better to acknowledge that there are issues and get help now than for you all to suffer later.
But above everything know that your opinion matters, and if you aren’t happy with the way your relationship is going then these issues need to be addressed.