I know you have a tripod, but it is nice sometimes not to have to use it for low light situations. I couldn't imagine being w/o my 35/1.4L nor my Zeiss 21/2.8. I use B+W MRC UV filters for all lenses, and for landscapes often a circ pol. You say you don't often do portraits, but I love my Zeiss 100/2.0 for portraits (and macro) -- give the Canon macro to your wife. Good luck, and have fun!