This is how dpreview had them rated...
Best of the bunch: Canon Powershot D10, Panasonic Lumix DMC-TS1, Pentax Optio W60
Middle of the road: Pentax Optio W80, Olympus Tough 6000
Bottom of the class: Olympus Tough 8000, Fujifilm Z33 WP
I have the Olympus 850SW and it has taken some nice pictures. I don't know how it compares with the Olympus Tough series. The only issue I have with mine is that it doesn't zoom very much...not an issue if you're taking pictures of a fish you caught but don't expect to be able to zoom in on wildlife at a distance.