Sure, compared to corresponding KB lenses such as the Canon EF 70-200mm 1: 2.8L, the Lumix is limited due to the MFT sensor with respect to the potential exemption, but personally I see it the other way round. If I want short exposure times in low light, I do not necessarily give up depth of field and / or the ISO hochschrauben. So I am flexible with this lens on MFT sensor, as with a corresponding push on KB sensor. Exemption fans would probably anyway not pick up the MFT sensor.
The GX Vario 35-100 1: 2.8 is worthwhile because of its built-in and very well-functioning image stabilizer (OIS) very good for the MFT Bodies of Panasonic, but it could just as well be operated on an Olympus. Personally I am not a proven tele-photographer, so I meet the 200 mm KB-equivalent at the upper end. If that's not enough, you would have to significantly more expensive 40-150 1: access 2.8 of Olympus. I would, however, this is too hard. In addition, my 5mm would as missing at the bottom against the Lumix 35-100. From the BQ, both lenses should not be much.
All in all, the Lumix GX Vario 35-100 1: 2.8 A highly recommended lens in combination with the 12-35 1: 2.8 on the same home provides a very flexible, compact and lightweight equipment. Incidentally, I run both lenses at a Lumix GH4 after I sold my Canon equipment for weight reasons a few months ago.
