The F1 is Fallkniven's flagship knife, being designed and accepted for Sweden's aircrew survival knife. The first design came with a small sheath that slipped into an upper thigh pocket flying those SAABS.If you've DRIVEN a SAAB, they have hte same space issues.
Sweden's survival scenarios,with smaller diameter northern arboreal trees really doesn't require a big chopper.
If there is any complaint with the SF1, many find the handle a little small.
An S1 will cost you @ $20 more +- and buy the satin finish. The darkened blades look real purty and proceed to scratch and wear with use and wind up being buffed out anyway.