Yes, I wonder about swapping out as I have the 7-14mm f4 Panasonic which is really good but does get purple blobs. (I know there is a fix for this and would attempt it myself but getting the components proves difficult). I was going to sell it after I make sure I'm happy with the Laowa. I'd like a faster lens but I don't want the size of the Olympus 7-14. I'd also like to be able to put filters on it which is again something I can't do with the P7-14 but can with the Laowa. I used to have the Samyang fisheye so am familiar with manual focus for this focal length.@RamblinR . It turned out to be a lemon (soft across the whole frame) and I'm waiting to hear from them about returning it. It's rather put me off in case I get another one with poor quality control so I've decided to just stick with the olly 9-18. Thinking about it in retrospect the loawa really is expensive for a manual lens when you can get the Olly 9-18 cheaper. I'm going to teach myself how to do panos rather than risk buying something wider.