Well it really depends on how you define leader.
While the iPhone is technically advanced, etc - the market share it has in the cellular phone industry does NOT make it a leader. Nokia is the leader and even RIM/Blackberry currently has double the market share (http://news.cnet.com/8301-13579_3-10245339-37.html )
The iPad may or may not follow the same path. Time, not opinion, will be the ultimate arbiter of the facts.
While the iPhone is technically advanced, etc - the market share it has in the cellular phone industry does NOT make it a leader. Nokia is the leader and even RIM/Blackberry currently has double the market share (http://news.cnet.com/8301-13579_3-10245339-37.html )
The iPad may or may not follow the same path. Time, not opinion, will be the ultimate arbiter of the facts.