For the long story short: Why does it seem like the 35 - 100mm Panasonic is under - represented in the :43: World? - For my needs (weather - sealed, outdoor/wildlife walk-around shooting) it seems like a great fit. Some potential drawbacks I can think of are that it is very costly, is a little bulky in our miniature world and might have a somewhat awkward focal length for some (slightly short for some wildlife applications, and not really wide enough to cram a ton of the scene in either). Is there something that I am missing with this lens that has kept it down in the :43: World and missing from your bag? For the unabridged version: I currently have the 14mm f2.5, 45mm f1.8 and the Oly 40 - 150 R. I am a very active individual and live in a place that is prone to serious weather. I tend towards landscape and portrait shooting and I have actually been enjoying the 40 - 150R for my outdoors shooting much more than the 14mm. The 40 - 150 allows me to pick something out of an open scene and easily compose it to taste while also being able to open up on the scene a decent bit if needed. I am working my way up to the point where I am ready to buy one of the more "premium" lenses for the m 4/3 system and my affection for the 40 -150 has lead me to consider the 75mm f1.8 and the 35 - 100mm Panasonic. Both of these lenses would be a significant upgrade in light gathering abilities, focus speed and overall IQ over my current zoom. I would LOVE to own the 75 (I have read numerous posts in this forum from people saying that is their go - to landscape lens) BUT the 35 - 100 seems to allow for much more flexibility if I am on the go (I always am) and it is weather sealed to boot! (I have the EM5 and have already been in some sketchy situations in weather with non - weather sealed lenses) Some drawbacks I can think of are: 1: The cost 2: The size (too heavy for a long hike around my neck?) 3: Not really long enough for some wildlife shooting (serious birding/etc) nor really wide enough to get some full scenes in. The 35 - 100 seems to be a great step up for me, but before I invest into one of the most expensive pieces of glass for the system I'd like to know, is there something that I am missing that is keeping it out of your bag?