It all started last fall, when I purchased a non-SWD 50-200/MMF-3/EC-14 to use on my GH4 as a lens for shooting motorsports. I was looking for something that would have the reach and speed I was looking for, and the 50-200 was really the only lens in the system to do so. Even using it as a manual focus lens, I was extremely impressed with lens' performance. It was very sharp, and the speed advantage over lenses covering the same focal range was very much appreciated. Then in March, I purchased a refurbished E-M1 during one of Olympus' discount sales (this one was 25% off, so I managed to get the camera for $570 after tax, and added a 2 year warranty for an extra $80). Using the EM1 with the 50-200 at some local auto-x events this spring, I was pretty damn impressed with how well the E-M1 and 50-200 could track the cars, both coming at me, and when panning. Based on this information, as well as now having every lens I owned stabilized, I decided to purchase a second E-M1. As a function of GAS, coupled with too much discretionary income, I've accumulated quite the "collection" of camera equipment. I current have: 2 E-M1's, both with the RRS base plate 2 GH4's (one is currently up for sale, holding on to the other one for its 4K) 1 GH4 battery grip (up for sale with the GH4) Sony RX100M4 (upgraded from a Canon S120, and I love this little beast. Simply amazing) Olympus 7-14 f/2.8 (upgraded from Panasonic 7-14 when I got my EM1's due to the purple flare issue, plus I wanted weather sealing. Very happy with this lens) Panasonic 12-35 f/2.8 Panasonic 35-100 f/2.8 Panasonic 45-175 f/4-5.6 Olympus 50-200 (non-SWD) PanaLeica 15mm f/1.7 PanaLeica 25mm f/1.4 Panasonic 42.5mm f/1.7 Olympus 75mm f/1.8 Panasonic FL-360L flash Panasonic FL-580L flash (currently broken, but I got it for free and plan on sending it in for repair once Texas isn't underwater anymore). Various other items, including multiple filters, tripods, ballheads, etc. So, for anyone who says photography is a cheap hobby, I call BS. In an effort to cut down on some of the gear, I'm considering the following: Sell my 12-35, 35-100, and 45-175, and use the money to purchase an Olympus 12-60. Not only would it cut down on my gear, but I would come out ahead by about $900, which I would put in to my "camera fund" account. With the recent rumors of the E-M1 Mk.II having 4K and a better PDAF system, I may sell my remaining GH4 and one of my E-M1's to purchase one (assuming that the reviews come back positive, which I can't imagine they wouldn't). My zoom's are really only used outdoors mostly, because f/2.8 on m43 isn't fast enough in a lot of poorly lit indoor areas with regards to ISO noise. And if I would use them indoors, I have 2 flashes that I could use (once I get the FL-580L repaired). So any difference in low-light AF shouldn't be a big deal, since I primarily use my primes when indoors. I would still maintain the weather sealing with the 12-60/MMF-3/EM-1, which is an important factor for me if I'm shooting an event that's all day and the weather conditions are spotty. The loss of aperture through the zoom range while not ideal, isn't a huge concern (it's about 3/4 a stop slower @ 35mm when compared to the 12-35). It's a trade-off that's necessary for the longer reach. Really the one thing that concerns me about the 12-60 is the "mustache" distortion @ 12mm. I'm aware of LR's ability to correct lens distortion, but has any successfully corrected mustache distortion in LR? Obviously, the other option on the table is the 14-54. The updsides to that lens is that it's faster (f/3.2 @ 35mm and f/3.5 @ 50mm, compared to f/3.7 @ 35mm and f/4 @ 50mm for the 12-60), it's smaller and lighter (not THAT big of a benefit for me, but nice to have none-the-less), it's cheaper, and it shares a 67mm thread diameter with my 50-200. While I would lose out on the wide angle (only 14mm vs 12mm), having the 7-14 f/2.8 may make up for that. I'd like to get people's opinions on selling my 12-35, 35-100, and 45-175 to consolidate lenses and pick up one of the 4/3 zooms instead. I'd also like to get people's opinions on the 12-60 versus the 14-54 II.