The Wizard, The Djin and The Wish

Hi to all!! I want ask to ask several questions Bg 2 Throne of Bhaal related.

1) What class can be best suited to cast a Wish (level 9) spells? Sorcerer? Mage? Wild Mage?

2) I want make a caster and i want keep him for all the journey between Bg1 ee to the end of the story (TOB)! What is the best caster for high levels? Sorcer? Wild mage? Normal mage? specialized mage?

3) What is requirement for have good % to make a good wish (for example memorized all spells like rested?) I need only high wisdom? Because i read that wish make a double check on int and wisdom, but i don't have any proof about it. I ask this, because if i make a sorcerer with low intelligence but enough wisdom can i use the same Wish?

4) I know that Sorcerer its pretty a broken class now: No requirements at all! Primary stats is intelligence, but no intelligence check on any spells or others! The devs have in mind to fix this? Fixing will broke previous character? Like a nerf or something?

Thanks to all! :D