Well there you go, So on your K10 either

The mk11 has Mk11 writen on it
Not alot really, You would be hard pushed tell much difference, most I would say prefer the Mk11, but I could be wrong

A couple of things to consider when buying, the cost of lenses and you will want them, the Nikon only uses motor driven lenses so that restricts, also you will require image stabilization lenses (Nikon VR) very expensive, if money no object fine. But if like most of us on a budget the Pentax is buy far the better option the image quality on the Pentax is brilliant.
That is just to name just a few items.
Ps. I had Nikon before I saw the light. and my pocket was getting empty.

Thats what I thought when I had the D80 and now if you want a D300 it is more than eeeek, and that is just the body

Well done, And welcome to the "Thinking mans camera" range.
I fell into that trap (Nikon) and got out quickly.

What do mean this morningevery morning more like

If it is a bad copy send it to Sigma to get it fixed that is why you have a guarantee with it. The Sigma 10-20mm is a very good lens I had one in my Nikon days.
It is no good just bunged in the cupboard.
And if you dont want it just send it to me, even better

Would you ever do that

I just noticed that bit, Did you see the one being advertised on Ebay under digital SLRs I belive it was an old "M"
I will own up to having a fully working E once even the light? meter.
My son is now over 40 so it is the grand children now that queue up for money

Or he may blow a gasket or something