taking a look back at the different sharingans, each has been able to do something seperate from the other and has their own pattern. itachi, with his mangekyou sharingan, can go into the mind of the victum and torture them; kakashi twice and sasuke twice. kakashi first when he fought itachi after the chunin exams and then again in shippuuden when the team was trying to save gaara and itachi stalled the team. for sasuke, the night of the massacre of the clan and once again after the chunin exams. all of this most will say, "duh, i remember this..." but just as a reminder. anyway, both were in serious condition and kept in the hospital for a long long time. also, with his eye, he can use a special flame known as amaterasu; only with assumptions, its powerful and can destroy anything.
recently, during the time of gaara's kidnapping, kakashi activated his own mangekyou sharingan (no real explination yet how), with its own ability and own pattern. he was able to (as a reminder) focus his eye on one location, distort the space around the area, and make deidara's arm disappear, completly. if he can learn to use it well, he can kill someone with just one look. aside from his mangekyou sharingan, he's been able to copy different jutsu and do them himself, but he's been using it aside from the mangekyou.
then there's sasuke. weather or not he's got a mangekyou sharingan or not (chances are, no), he's displayed the ability to go into what has been called (by orochimaru), the "other dimention". this dimention is where sasuke fought orochimaru and was the place where orochimaru had done his soul transfering. sasuke also has performed this soul technique when he looked into naruto and saw the soul of the kyuubi. But i wouldn't call this a sharingan technique since sasuke, most likely, learned this from orochimaru, and orochimaru being a ninja with no eye clan ability. so if orochimaru knew how to do it, then i guess its just something that sasuke's sharingan can do and maybe we don't know what his can really do just yet. although when sasuke fought deidara, he gave that chakra color and used it to cleverly beat deidara. not being so much as a good power, it can be considered helpful in making good stratagies.
could the sharingan's abilities develop from what kind of ninja the person is or how they fight?
itachi - since a kid, a skilled ninja. being so good at a young age, guess that he doesn't care for anyone and can manage to torture people without remorse. and weather he's determined to do something great for the future, i guess that he has to kill to get it done and can't let anything get in the way.
kakashi - well, he's said it himself; the only jutsu he's ever made was chidori. with his sharingan, its been a convenience to rely on it. kakashi was also a member of ANBU. the ANBU squad seem like a specific kind of assassin ninja group (even though ninjas are basicly assassins) and kakashi was a famous ninja of the ANBU.
sasuke - very smart and a clever ninja. although he's not a genius like shikimaru, he has those ninja smarts and proven to know how to carry himself in battle. he's even more determined to kill itachi and his desire has carried him to learn and aquire many skills.
tobi - well, well, well, he has a sharingan (dont care if you say if he's obito, but yeah, he has one). has he been playing as a 'comic releif' character from his real self? probably. but since he said that he'll be showing the power of madara uchiha; who knows what he could be capable of. but if he's as powerful as he seems, then he'll more than likely have his own mangekyou sharingan. but what will really determine what abilities his sharingan has are what kind of a person he is.