first let me tell you i am a HUGE fan of Gerber and own alot of their knives and tools. that being said, i do not like the Steadfast very much as a large sheath knife for my personal preferances. this does not mean that it is a bad knife though.
it is made of 440A stainless steel, which is ok, however it is a lower grade steel. i have smaller folders that are made out of 440A, and thats ok, im not expecting to cut wood or dig a hole or really abuse my smaller folders. the steadfast may be easy to sharpen, but may not hold an edge for long if used heavily in a serious situation.
the other reason i personally dont care for it is that, due to the major finger grooves it is only comfortable to hold the knife one way. i use knives that can be held with the blade pointed up or down in the hand.
The best current production Gerber sheath knife is the LMF II; i now own two of them, one to always keep on my emergency vest, the other i take out in the wilds. This knife has a ton of features and is tough as nails.
For more info, look at this link:
http://www.policeone.com/police-products/duty-gear/knives/press-releases/120430/
Best to you and yours- Eric