This is my 6th Infiniti, and I've never seen anything like what you are describing. If I clean the windows, they are crystal clear under all conditions.Here is Arizona we have an issue with sand pitted windshields. If you happen to be driving into a big haboob (dust storm) on the freeway, chances are your windshield is going to have thousands of pits in the glass. You usually only seem them when driving into the sun.
I drove my new Q50 into the sun last week and saw what looked like thousands of sand pits in the windshield. I went to the dealer yesterday to discuss since I don't want a brand new car with a pitted windshield. One of the service guys took me out a new QX60 that was facing into the afternoon sun. Viola it has the same pitted look in the windshield. Then he showed me the side windows and they were also had the same pitted look. Then he had me look carefully at my tinted side windows they too had the look.
Turns out for the past couple of years this has been par for the course for all Infiniti glass. There is some type of crystallization in the glass that mimics the look of sand pitted glass. I for one do not like this change in glass. Anyone else notice this, or am I sensitive to the issue since we do get sand pitted windshields?