IQ-wise I suppose its a no-brainer. My most critical usage is portraits of family/friends around the house. But I need some encouragement to pulll the trigger on spending the $$$. I'm certainly a beginner and cautious at spending money on a nice to have item. Also, as a casual user would I be missing out on the zoom? Do you think cropping from the 17mm photo is as good as what the kit zoom would produce? Thanks in advance!