Copland CTA301 mkII vs. Copland CTA 305 anyone?

Wanted to know what the sonic difference was between these 2 preamps. I own the cta 301 mkII and consider it a 'giant killer'. Detailed, transparent, smooth, huge soundstage, etc..... it just offers incedible bang for the buck. Is the new Copland cta 305 better, worse?
Thanks guys
dudeaudio