Nokia has improved image processing algorithms in Amber to offer better noise reduction, color reproduction, exposure and autofocus. It's just a matter of taste. Opinions differ from person to person.
Though you'll find difference in image quality when taking pictures from Nokia Pro Cam app as compared to default one due to different algorithms. Many users have reported Yellow hue in pictures taken from Nokia Pro Cam but that's a universal issue, so don't worry about it. There are plenty of awesome camera apps out there for us Lumia users like Camera360, Oneshot and Proshot. Its just a matter of algorithms.
So don't stress it too much buddy. It's not like end of the world. You'll eventually have to update to Amber anyway.