I just sold my large drone that used the GH4 + Oly 12mm f2.0 / Oly 45 f1.8. I still have the camera and lens, just the drone went. So, I'm thinking about what lenses I actually use day to day outside of the drone environment, the ones I'd pick up if I'm walking out the door for casual shooting, or maybe taking some room shots for a friend who rents flats (apartments), or perhaps going on a cruise (the major vacation type I take). I don't need the kit kit to be tiny and pocketable, I'd buy a P&S for that, so having two or three lenses and a couple of bodies is OK, but I'm still thinking of reducing the amount of kit I do take with me. I use the EM1 for photos more than the GH4, with the GH4 used more for video with the occasional photo where appropriate. Here's the glass I currently have: Primes: Olympus 12mm f2.0 Lumix 14mm f2.5 Lumix 20mm f1.7 Olympus 45mm f1.8 Zooms: Lumix 7-14 f4.0 Lumix 12-35 f2.8 Lumix 35-100 f2.8 Lumix 14-140 f3.5-5.6 ASPH In terms of the primes, I have to admit I tend not to use them much when walking about and in reality the Oly 12 & 45 were only bought to use with the drone (it had specific lens size/weight limitations). The Lumix 14 f2.5 is almost never used and the 20 only when I'm really wanting to be small and light, or perhaps lower light. I find zooms so much more convenient compared to the primes, especially when you can't zoom with your feet (brick walls, edge of water etc) and for me there simply isn't enough pixel quality difference on real world photos to worry about. OK, for shallower DOF, you can't beat a prime, but I'm not a shallow DOF kinda guy anymore As for the zooms, the 7-14 gets used when I need wide, particularly in small spaces! The 12-35 is on the camera the majority of the rest of the time and the 35-100 only when I need longer. Seems simple, right? GAS Alert! I was thinking about swapping the Lumix 7-14 f4.0 for the Oly 7-14 f2.8, partly because it's an extra stop of light and partly because of the well documented flare problems with the Lumix on the Olympus body. I've had it happen several times and it was a pain to fix in post. I realise the Oly is bigger and heavier, but then if I wasn't carrying around all the primes as well then it would all balance out. After that, I was thinking about selling some or all the primes too, and maybe starting again with different primes 'if' the situation arose where I felt the need. So, questions... 1) If you had the Lumix 7-14 and swapped to the Oly 7-14 are you happy with the swap? Would you do it again? If not, what causes the regret? 2) If you could keep just one of the primes I have - which one and why? 3) If you could sell all the primes I have and replace with just one - which one and why?