It does not help to compare them to birds you have known. The comparison is too each other. I can see that there is some variability within your flock. The type is not uniform. Neither is size etc.
All you need is a couple pens. It is not required to "line them all up" though it would be helpful. A couple pens, and compare one to the other, making notes on the particulars. One stays, and the other does not, so to speak. If you wanted, once you were down to 50%, go again.
I would keep two cockerels and four pullets from this batch.
I understand that the comparison needs to be made to each other. I was just trying to communicate that they are broad and deep birds. I'm also trying to understand what the SOP is calling for when I look at the flock.
They look more uniform in size than the pics show, though there are small differences. "Type" was not the word I should have used.