What constitutes as a mirror finish and other sharpening ?'s

I have some sharpening woes/questions and general lack of experience (and confidence). Now that I got the disclaimer out of the way, I'll start with my general process. I have hock A2 blades in a No.4 and No. 7, additionally a vintage Stanley blade in my No. 6. Process is a DMT coarse and extra coarse duo for primary bevel setting and flattening purposes. This is then followed by a sigma select II 1200, and a sigma power 8k. Last step is buffing compound on MDF. I get a pretty good edge that will take hair off my arm, but I wouldn't say it shaves hair off my arm. I do apply a micro bevel as well. I have never handled "professionally" sharp tools before so I have a hard time gauging the level of sharpness.

To the questions:

I get a mirror finish on the back but it has a lot of visible scratches that are deeper. Is this normal or do I need to continue to work the back to remove these? Am I finishing with a high enough grit? (my opinion is yes, but based on my level of knowledge I am going to ask).
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The he vintage iron back (top blade) was pretty out of flat and spent about 3 hours and still had a corner not buff out. It has a lot of camber on it and the No.6 just got rehabbed back into service, it was pretty rough shape and the plan is for it to work as a scrub type plane.

Now that I have rambled on I forget what my 2nd question is, guess I'll ask when it comes back to me.

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What constitutes as a mirror finish and other sharpening ?'s