just a few that i can think of right now
MT5 - development
has a debugger - a nice addition that saves a lot of pain
is a little harder on you for programming errors like indexes that go out of bounds
object oriented - a bit of a double edge sword in my mind - it is a little harder a first to "whip some thing up" after time, it should be easier as the code base swells.
mt4 does not easily recompile - there are tools to help, but it will be a journey at first.
MT5 - trading
works with orders, deals and positions instead of just orders - need to get your mind around that a bit... if you open many trades in different directions you will only see *ONE* position for that pair. It blows your mind to see the current price is 7 digits. So much for normalizing on 4
calender of upcoming new events
MT5 - testing
back testing is quite good - at least I've been led to think so from the testing I've done. I have an dual Xeon (8 physical cores) and it spits out resuts concurrently on optimizes
networking of back testing - can send back testing to another computer - I haven't tested it, but it looks promising

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I am currently using MT4 and do not have th feeling I am missing anything, except for iPhone/iPad access.
However, I have hired a programmer and expect to start developing EA's soon. Because of that I am wondering if I should change to MT5 to make a start on the latest platform.
I have made a list of the pro's of both as far as I can oversee it (have no MT5 experience). Please give me your additions and comments.
MT5 pro:
- latest platform as start for my developments
- mobile access possible
MT4 pro:
- more bug proof than newer MT5
- bigger number of indicators for sale/programmers for hire with experience
- can stay with current broker (must change for MT5 since they do not support that)
How about portability from MT4 to 5? (read somewhere not possible?) How about speed, reliability, features? (not the list of ~, but your opinion if in general the new features are very useful or not)
Thanks