I was curious so I just take my 10mm combo wrenches(3 ratchetwrenches) and put it on a 10mm stahlwille allen key and put some leverage on it
All brands was spreading pretty easely! Here is my top 9 list with the best first! Some wrenches are shorter/longer so its not the best comparision,but interesting anyway
1: Stahlwille open box 14 Germany
2: Stahlwille open box 13 Germany
3: Bahco pu sweden
4: sandvik belzer 1952m Germany
5: Bahco 111m Spain
6: Bahco 1952m Argentina
7: Wurth zebra combination ratcheting wrench
8: Facom 467 combination rat.wrench
9 :Wurth zebra combination rat.flexhead wrench
The ratcheting wrenches was a disaster when it comes to spreading the jaws
7: Wurth was very soft and spreads very easily! 8:Facom even more and the last wurth was a complete disaster! It spreads so easy its sick! Look on the last pic and compare to old bahco how fat it is! 
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