I've been off the boards for a month and when I looked at this thread there were 104 unread posts! Some great sketches, images, and observations which I just got caught up on.
My last observation of C/2012 K5 was November 22nd when it was in Bootes with almost daily solid cloud cover since then so when it cleared off the evening of the 7th (8th UT), I was anxious to get another look at the comet. By now it was in Taurus very near Aldebaran.
I was surprised how bright it was. My GoTo is a little off and put the comet core just outside the field of view but I could see the glow of the coma on the edge of the FOV.
The tail wasn't uniformly diffuse--it appeared to have streamers in it.
As others have noted, this is a fast mover--probably the fastest I have ever observed. I placed the comet just below the center of the FOV so I could include the tail in my sketch and in a half hour it had moved completely out of view.
@ Mike Phillips--you must have imaged the comet shortly after I sketched it. The starfield behind the comet trailing behind the tail to the left is the starfield in my sketch.
I'll tell you what people--it's getting crowded up there in space. A meteor went through my FOV during this observation followed shortly thereafter by a satellite.
Best to all,