This is a tool made by DingoGS, if you have any comments or suggestions (or donations!) please EvE Mail DingoGS in game with them.
I couldn't do a more detailed analysis because killmails don't have all the data I would wish (Like Logistics Pilots not showing up, or people who came but didn't kill anyone and left won't show up either). However I hope this is a good enough start.
Also I can only tell how much every team lost, not so much how much every team killed. This is specially messy if there is a third party on the encounter.
Please remember to donate isk if you like and use this often, save this site from having a monthly fee!
All the data is obtained through ZKillboard's API.