Every single gaming IP Sony has purchased pales in comparison to the sheer financial juggernaut that is COD. Purchasing Activision is bigger than all of Microsoft's other gaming purchases combined. There's a good chance it's bigger than all of the gaming purchases from Sony and Microsoft pre-Activision — combined.
As a gaming entity, Activision is in the same ballpark in size as Sony. Sony's market cap last I checked was ~$120b, but they also have a consumer electronics division, music division, movie division, image sensors division, etc. Without an acquisition markup Activision might be worth ~$50b today or so, and Sony's gaming-only value might be in the $60-80b range if I had to guess.
Activision-Blizzard has about 17,000 employees. Naughty Dog has 400.
Past acquisitions — by anyone — in the gaming market are completely and utterly incomparable to this acquisition.