There is actually a lot of hype about F1,S1 etc.
Guys at FKN say that by means of laminating breaking point has been increased by 20% or so, but outer layers are made of 420J2, then it would bend far before breaking point :jerkit:
When I had to face a similar decision I opted for Extrema Ratio Shrapnel, which, BTW is available also without upper guard.
Some considerations:
F1 is 4.5mm thick and Shrapnel 6.3mm (per my caliper readings), thus 1.8mm thicker. Which makes it 40% thicker at thickest point.
F1 is 10cm long, Shrapnel is 11cm long.
F1 is laminated with costless 420J2 steel, Shrapnel is integrally made of N690, which is nearly identical in chemistry to VG10.
F1's edge is convex and you'll NEVER restore it as such unless you'll have a slack belt (I don't think you'll carry a spare one while trekking or camping).
F1 is coated with Ceracoat, Shrapnel with ZrN (Zirconium Nitride) which performs a 2800 on Vickers Scale, has excellent erosion resistance, good lubricity and ductility and it is thermally stable up to 1050°F/565°C. Not only it does protect steel, it helps on blade hardness and even toughness to some extents. No literature about Ceracoat but I had rough times with a similar coating on my Gladius torch (now sold).
F1 has a "glued" handle in a 'take it or leave it' style. Break it or damage it and you'll have to send the whole knife back to factory. Shrapnel has a detachable serviceable handle, thus you can clean the whole knife, from tip to tang. Break the handle and all you'll have to do is just to order another one.
Shrapnel has a forprene handle, which handles temperatures from -40°C to +150°C. F1's Thermorun handle looks like being less performing.
F1 has a kydex sheath (tek-lok is an option you've got to buy). Shrapnel ships with a tek-lok ABS sheath.
Last but not least: Fallkniven offers a two years warranty while Extrema Ratio offers a LIFETIME one. Full stop.
In Italy I paid 167EUR for my Shrapnel, when I should have paid 130EUR for F1: this NOT the correct price ratio IMHO !!
So, Collecter, it is not me who is gonna flame you
