No, he hasn't. All of his heads/face shapes are the exact same NEEDS MOAR LOOMIS blobs. His anatomy is still shit, his composition, though better, is extremely basic stock-photo shit, and his lines are still the exact same uniform lines as they've always been.
He has been able to cram more badly-drawn detail into his panels, but that doesn't mean he's gotten better at drawing. He just found out what an eraser is.
His lack of development whatsoever is extremely unsettling for me. I just can't comprehend how you can draw for that long and NOT CHANGE AT ALL. What the shit.