I can see why you would like to know, I habitually give lens and camera descriptions on almost every photo's metadata after a lr import, and it can be a little puzzling at times, although my 28mm and 50mm are considerably easier to tell apart. I am going to vote for top 35 and bottom 50, as the angles of the wall in the violin shot appear to be considerably more distorted than the glass wall in the portrait. You won't always have straight edges to gauge this with, so I would suggest starting to document your shots with a notepad or something like the Android app Exif4Film (I am trying to train myself on this practice too).