I could probably drudge up some statistics here, but I'm lazy and I don't really see how that would get you anywhere. Instead I'm going to ramble on with observations on Cecil's battle uses and weaponry.
Cecil is basically a straight out physical fighter. Though he gains white magic midway through the game, when you're using Cecil for healing, it's usually a sign you are screwed. Cecil's main weapons are swords, though he can use bows and axes as well. He equips heavy armor and generally has ridiculous defense and hp, while the speed is middling. His physical attack is consistantly the strongest in the game.
Cecil's role in your party is to suck up damage. He accomplishes this wonderfully with the cover ability and his abundance of hit points. The man is the walking pilgrim's progress. In your final party, Cecil will not be doing as much damage with his physical as some of the most powerful spells in the game, but his cover ability will be invaluble as Rydia and Edge tend to die often. Especially Edge, as his weapons make him a front row fighter with a nearly negative magic defense score.
In additon to regular swords, which can be equipped by Kain, Cecil also has access to two special classes of swords. The first, "Dark" swords, have names like "Death" and "Shadow" are used when Cecil is a Dark Knight. The holy swords have names like "Light", "Legend", and "Excalibur" and can only be equipped by Paladin Cecil. It should also probably be noted that although Cecil can equip axes and bows, he's not ever really going to do that except in that specific dungeon where you can't use metal weapons. Kain, while he can also use swords, has his own unique class of weapons that he's generally better with, and so swords are associated with Cecil, in true main character fashion.
Cecil's final weapon in the original Final Fantasy IV is called "Ragnarok". This is the "destruction of the powers" in Norse mythology, but it has a legacy in RPGs in general as well. In Final Fantasy VI, the last weapon is also called Ragnarok, and it can be traded for the Illumina at the colliseum. Illumina sounds a lot like Lightbringer, which is the name of Cecil's new Final Fantasy Advance weapon.
If you can find the elusive Pink Puff and get it to drop that special item, Cecil has access to the ridiculous Adamant Armor. If you're like me and don't bother, he still has access to the best armor in the game. In Final Fantasy IV Advance, Ceasar's Plate is Cecil's unique treasure. The odd name, as far as I can tell, is a reference to Julius Caesar, who was stabbed in the back by his best friend, if you believe the stories. Cecil certainly has his betrayers.