As for the SAR4, it's 3 1/4" longer than the F1 and probably weighs about 3x as much (F1 is a mere 150grams).
Never owned a Meaner before, but it's probably the closest match from the busse line up, at least out of the ones that are accessible and reasonably priced.
The Scrapyard "yard keeper" is pretty similar, and a good knife that I can vouch for.
You might want to look into the BRKT Gunny, it looks quite promising and I've heard nothing but good things about it and its big brother the "Bravo-1"