There are only two things I don't like about the Otus 1.4/55:Price is price and I agree that you should really want it to buy it. I also agree on the bokeh issue. But there is something I don´t really understand about boked. Because it varies, depending on light source.
1) The price... because I would have to sacrifice too much other stuff to buy it
2) The onion bokeh... but this is only really noticeable with specular highlights that are OOF. In normal shots its not really noticeable.
I have attached two examples. The first is of five candle lights and the second is a chandelier with electric light. The bokeh from the electric light has a clear onion bokeh, whereas the candle lights are clean. If someone could explain why this happens, it would be most appreciated.
This is due to the nature of light wavefronts and diffraction. Diffraction is an INTRINSIC property of light. It exists within the wavefront itself, to be 100% accurate...it is not actually due to light bending around obstructions or anything like that. Light diffracts around obstacles and through openings intrinsically, the effect of which appears to be the "bending" of light (hence the colloquial descriptive terms most often used). The difference between the two sample photos you took is that one is a "naked" light source...the flames of candles; the other is an enclosed light source...either light emitting diodes or tungsten filaments, encased within a class or plastic bulb.
Because of imperfections and impurities in the bulb of your lights, the light coming from them is not a pure, uninterrupted wavefront. Therefor, the effects of diffraction, which occurs when the wavefront from the enclosed light source encounters imperfections and impurities (i.e. a microscopic opaque granule in the glass or plastic of the bulb), show up in your boke blur circles.
There is nothing wrong with your lens. The difference in the two images is due to the difference in the nature of the wavefronts coming from them. Flame is THE actual light source, and so long as there is no other obstruction between you and the flame, a pure, unadulterated wavefront enters your lens. The electric lights are a light source enclosed within a bulb, and an already diffracted wavefront is what enters your lens.
An excellent (although rather technical) explanation of the true nature of light can be found here:
According to Huygens' principle, every wavefront point is a source of secondary wavelets, through which spreads in the direction of propagation. This constitutes a micro-structure of energy field propagation, with the energy advancing in the direction of the wavefront, but also spreading out in other directions. Principal waves, or wavefronts, form in the direction determined by extending straight lines from the point source. Waves moving in other directions generate phase difference, preventing them from forming another effective wavefront (FIG. 1, top right). However, these diffracted waves do interfere with both, principal waves and among themselves.
As a consequence of the existence of diffracted wave energy, placing obstruction of some form in the light path will result in the "emergence" of this energy in the space behind obstruction. But the obstruction did not change anything in the way the light propagates - it merely took out energy of the blocked out principal waves, with the remaining diffracted field creating some form of intensity distribution in the space behind obstruction - the diffraction pattern.
Similarly, by limiting energy field to an aperture, the portion passing through it is separated from the rest of the field, and its energy - this time consisting from both, aperture-shaped principal waves and diffracted waves within - will create a pattern of energy distribution behind the aperture. Again, there is no actual change in propagation for the light passing the aperture, including those close to the edge of obstruction (light does not "bend around the edge"); whatever the form of energy distribution behind the aperture, it is caused by the interference of primary and diffracted waves inherent to the energy field (FIG. 1, middle and bottom).