Small sensored cameras most of time have slow lenses - coming back to full frame, be it film or digital, reminds me of the creative power, the f1.4 depth of field can offer. Sometimes the background is too busy for comfort and the 1.4 allows the blur - or sometimes the attention to the scene is important to get in one area - and this type of lens allows that. Or - it becomes creativity of its own sake. Either way it becomes another creative tool for reference.