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Lol. That photo is taken in the dark, you can't see anything. All I can see is that it looks like it needs proper foot retention and the rider is a T-Rex. :)
The BT seatpost is probably very expensive to replace if it slips/breaks. The Kalavinka post will be a standard size giving you a good choice of posts to choose from if you need to. The two wedges around the round post are probably more secure than whatever solution the BT uses as well.
The Kalavinka one is no way near as bad you are making out. Both frames are great.
roboto-
The only thing I'm saying is that I don't like a regular style round seatpost in a frame where the part where the seatpost is mounted looks like that. It would look a lot better if it has an aero seatpost to match the frame. Sure it's easier to have a standard choice, but in a frame like that it looks off. I even like the rest of the frame. Just not that part. The bike is probably more then epic to ride on. The design is probably the most functional there is and the most logical choice, I just don't like that specific part of the entire bike. And only that. It's just the type of seatpost.
Just hammer (by lack of other words) something like this in that frame and it's epic:
Arawn
Not at all. Look at the seatpost of the picture kenzo posted. That would look so much better on the kalavinka frame.