I was wondering it in Real world, do you notice these problems ?
Is the Sharpness lose a issue ?
There is no sharpness loss. What you perceive as softness is actually the true resolution of the camera which is revealed by the filter. Yes, it's that soft in H264 mode -- scary. Aliasing creates false detail / jagged edges, which is why mark ii footage in raw sometimes looks a little "crispy". The filter removes this.
With the filter the images are really nice, and very detailed. I saw the charts before I bought one, and I was skeptical. However in most *practical* situations, the jaggies are greatly reduced. Hair is a great example. Hair almost always looks terrible with no filter -- horrendous false color that is visible with the slightest motion of your subject. This is nearly eliminated with the filter. However if you shoot things with lots of geometric patterns, then a 5D2 is not for you, even with the filter.
Also, the filter does reduce the resolution of still images. You must remove the filter for full resolution stills, and this can be a little annoying. For things like taking a snapshot of lighting setups, I just leave it in. The images are surprisingly useful. In fact, taking a 21MP still with the filter installed, and zooming all the way in, is a good way to see just how good the filter really is. The images are far more detailed than H264 mode.