<p>OP said: "Is there any way for me to know whether FF will make a difference for me, without just buying one and shooting it?"<br /> Usually people who ask these questions don't need a full frame camera...why? because if they needed one they would know the reasons and the benefits of getting one. So maybe FF is not your best chance and you be better off with something less pricey, thus having the opportunity to get good glass which will make THE difference. Cheers!</p>