Hi Sumesh, I wanted the 4K, but it was taking tooo long for the release so I settled for the 2.5 K.
I am very happy with it. Will upload my first commercial shoot next week or so. Even with cheaper EF lenses you get amazing footage if you film raw and its very filmic.
One thing, I believe if you are planning to shoot RAW this is awesome cam. If you just going to shoot proress then I would just get a proress cam, For me its all in the RAW.
I bought the camera and two ssd cards, borrowed some lenses, did my first commercial shoot like that.
You will need to spend some good time on post though.