My date asked me if she's prettier than my last girlfriend
It was our second date and she asked me if she is prettier than my longterm girlfriend from a few years ago.
I hesitated... I'd say objectively speaking, that girlfriend was prettier. But I like this girls appearance and personality too. They look different. I could see myself growing to like this new girls appearance more but I was caught off guard with this question. I tried to say that stuff like that is subjective and she cut me off and said: "just say yes". I eventually said I thought she was very attractive but I didn't say: "yes you are prettier than her".
Is it normal for her to ask this? I feel like it's unfair. Also, did I fuck up my response?