It's hard to quantify, but I have used CakePHP, Yii, Rails (0.9 through 4), Django and plenty of home-grown 'frameworks'. From all those the most cohesive and understandable to me was Rails followed by Yii (surprisingly).
Maybe it's the docs or structure, but Rails and Yii have a strong opinion and it seems their developers have both CS smarts and industry experience, which shows in the structure and code.
I'm sure in time Laravel will mature and improve. Currently it just feels like there's a lot more hype than it merits.