For reasons which I don't fully understand or condone (), I'm now on my second copies of both the 9-18 and 7-14. I bought the 9-18 first and then bought the 7-14. I found the IQ on the 7-14 notably better but the purple flare and, more importantly, the lack of an easy filter solution eventually pushed me to sell it. I soldiered on with the 9-18 but I was never happy with the IQ - esp corner sharpness which was quite poor no matter how much I stopped it down. I eventually gave in and sold it, buying another 7-14. I then remembered all the reasons why I sold my first copy! A DIY attempt on a filter holder just didn't work too well at anything wider than 10mm and to cap it all I was taking shots indoors last week where there were bright halogen lights and the purple blobs caused by flare from them is just ugly, ugly, ugly. Flare from the sun can often be controlled by careful positioning, but there was nothing I could about it indoors with so many small bright light sources. So, I just picked up another copy of the 9-18 - I think because I was possessed by some demons lurking at the bottom of a bottle of red wine. But, lo! the new copy is a cracker! It's very, very nearly as sharp as the 7-14. Certainly close enough that blind A/B comparisons can fool me. Now I understand those posts saying that the IQ from the 9-18 is good! So, I think the 7-14 will be up for sale. I'd always been somewhat sceptical about copy variation stories before, but now I'm a believer!