I've commented on this in years past. I have noticed that when winter rolls around (now in the northern hemisphere) I am more prone to serious (and money-losing) gear churn inclinations. With the shorter, darker days, and more time sitting around, it's much easier to look at your gear and think that the problem with your inspiration is you have the wrong lens, body, filter, camera bag, etc. etc. If you just had something different, you'd be on fire again. I would posit that it's just the nature of being indoors with less light. By all means, if you want to try something new, have at it, but over my 6-7 years as a (more or less serious) hobbyist, I've come to recognize the winter doldrums as a deceiver of gear unhappiness. I cannot count the number of times I've churned gear in the winter, have been no happier with my shots, and ended up re-buying my moved-on lenses again in the spring or summer, and losing money all the while. Best to use that money for some full spectrum light therapy, a trip (far more inspirational than a new lens!), a massage, a ski weekend, or whatnot. Happy Shooting!