As a senior citizen about to take a one-time vacation trip to China and Tibet, I am having trouble deciding on which lens to take for my OM-D. [Sold my Nikon gear 5-6 yrs ago-- too big-too heavy-- and went M 4/3]. The trip is a small group [10-12] sightseeing vacation. I have maybe too many lens-- the Oly 9-18, Pana 20 1.7, Pana 12-35 2.8, and Pana 45-175. I have checked what ranges I often shoot. On other trips in the last few years [when I had the 9-18 and the Pana 14-140], about 70% of my "keepers" were between 12 and 40mm, with <10% at 9-12mm and 20% at 45-140mm. I then got the Pana 20 and loved the speed, quality, etc, so I just bought the Pana 12-35 for good speed/quality also. I will take the 20 and 12-35 for sure, but not sure about the others... want to travel light BUT hate to not have the correct "gun" when needed! Any opinions re what type of sighseeing pics I will most likely encounter and what lens to take/not take will be appreciated -- Tks !