Here you go SMH, sorry about the phone pics. I'd like to point out that my 16 is different from the Reg. Production because of the coating, roll stamp, and most importantly: grind. So I will not really touch on those features. Also while I have used my ESEE 4, I do not play with my 16 so I will not touch on how they compare in use either. Pics:
As you can see they are very similiar in length, if you'd like to know the exact measurments there are many places to find them starting in our forum stickies. The ESEE 4 has a little more heft to it and is a little thicker (sorry, forgot to take a spine shot). The regular 16 will be flat ground which I imagine will shave even a little more weight off of it. Getting micarta stock on the ESEE 4 is nice, but really you ARE paying for it. I still give the ergos to the 16 by far, it is one of the most comfortable knives I have ever held. As far as sheaths, there are great things about both. I love the kydex on the ESEE, and I LOVE how modular it is, however as a ready to go, working system the BK16 sheath is very impressive and it is really nice to have that front pocket already included on the BK sheath (any hardcore ESEE dudes that see how my sheath is set up, yeah, it's probably wrong, but it works for me). I believe edge retention/steel quality in general is a little higher on the ESEE, not a steel geek myself so can't say for certain but I love all of my 1095CV BKs and have no problems with them so it kind of like, how many alligators are you going to be skinning per day anyways? Both will do their job well.
Not going to declare a winner, would be unfair as I have not gotten to put a BK16 through the paces. Both have awesome things about them.