I always thought that Wizards in 3.5 were better than Sorcs. The having to memorise a spell in a higher slot with MM applied was fine, whereas the sorc has to use a full round action to cast with MMs applied and thus couldn't use quicken spell (though I would've thought most people would house rule that one....)
Sorcs have been much improved it seems in PFRPG how they compare to wizards I don't know yet as I haven't yet looked in depth at Wizard whereas I have for sorc (as statting up a Council of Thieves Sorc.)