I currently shoot with the 18-105, 20 & 16-50 with my NEX-6 bodies. Ever since I purchased the 18-105, the 16-50 hasn't been used much and the 20mm comes out when I need to go compact. I'm thinking of selling the 16-50 and getting the Sony VCL-ECU1 adapter for those oft times I need something slightly wider. What do you guys/gals think? Should I trade up or just keep all three? Thanks for any opinions!