They have completely different character.
The Makro-Sonnar 100/2.8 is bar none the sharpest optic in the entire N series. It is sharper wide open at f/2.8 than N Planar 85/1.4 stopped down to f/2.8. You may experience double-edged bokeh at medium focusing distance, but this improves as you go into the macro range. Its autofocus is very slow and unable to catch most moving subjects.
Planar 85/1.4 has amazing capability to render e.g. the texture of garments realistically and with three dimensionality. At wide open it has a swirly dreamly look. The AF is reasonably fast.
Both lenses do not change length at any focusing distance, a design hallmark for the entire N-series with the sole exception of VS28-80/3.5-5.6 and a few very rare samples of the initial N Planar 50/1.4 production run.