SX50 vs G15 vs S110 - what am I giving up?

Great camera T4I and the best thing is the video capabilities. I bought the same combo but regret not getting the 18-135 stm lens with it. Now a days it is on sale and the price difference is around hundred bucks compared to 18-55 lens. If you can still hunt for a deal and replace the existing combo with the 18-135 would be better, the lens has a longer zoom, better motor for video (very silent) and you dont have to buy another zoom in the future. A 50 mm prime lens is a good addition in future. Hope it helps. Happy new year!