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Assuming the IQ is good but not stellar (compared to 20/25/45), what would be the pricing sweet spot that would make it possible for this lens to compete? How about €150?

Third party lens manufacturers are always good at making constant aperture zoom lenses, so I really hope Sigma will do something like that, and slap both Pana’s and Oly’s faces.

Don’t hold your breath for something impressive. Most likely it will be the same lens as the Sony E with a different mount, just like they did with regular 4/3.

Sigma is quickly becoming a sad company, it’s lenses are getting expensive and it’s bodies are ridiculous.

The only thing they have that is good is their sensor.

I hope there is gonna be a 30mm f:1.4!

Unfortunately, the list of Sigma lenses for FT is mostly a list of lenses which used to be available. Only three of them are left in production as of today (see http://www.four-thirds.org):

Sigma 10-20mm f/4-5.6 DISCONTINUED
Sigma 18-50mm f/2.8 DISCONTINUED
Sigma 18-50mm f/3.5-5.6 DISCONTINUED
Sigma 18-125mm f/3.5-5.6 DISCONTINUED
Sigma 24mm f/1.8 DISCONTINUED
Sigma 30mm f/1.4
Sigma 50mm f/1.4
Sigma 50-500mm f/4-6.3 DISCONTINUED
Sigma 55-500mm f/4-5.6 DISCONTINUED
Sigma 70-200mm f/2.8 DISCONTINUED
Sigma 105mm f/2.8 DISCONTINUED
Sigma 135-400mm f/4-5.6 DISCONTINUED
Sigma 150mm f/2.8
Sigma 300-800mm f/5.6 DISCONTINUED

And at Photokina 2010 in Cologne, when there still were, I think, four of five lenses left, I was told that I shouldn’t expect any intensified Sigma investment in FT in the future, but that it would probably become even less.

I’d buy the 50 1.4

After Tamron announcement for E-mount cameras I suspect that sigma will show what they were working on this past year. Hopefully along with that they prepared lenses for m4/3 cameras(and not only the same lens with different mount like samyang).
Would love to see some healthy competition between different systems

My guess for the next Sigma lenses

First I am glad Sigma has taken the risk to produce m4/3 lenses. It helps preserve the longevity of the system.

The following lenses are what I think Sigma will produce.

First lens – 70 mm macro, probably 2.8 minimum, maybe even f2 or better.

Reason, 1. Making a 30 mm macro would not be wise since a 45mm macro is already available and most times a larger lens to subject distance is extremely helpful with macro.

Reason 2. They already make a full frame 70 mm macro and they make a “new” 150 full frame macro. they must know these lenses sell and they command premium prices. While a m4/3 30 mm is close to a full frame 70, it is still a difference that is in the wrong direction, as previously mentioned.

Reason 3. The lens mounts for the optics for the 70 mm could be used with some changes to the optics to account for the closer flange to sensor distance. More importantly, the image stabilization used for the “new” 150 mm macro would be pretty close to the image stabilization a 70 mm micro 4/3 lens would need. Easier to cross utilize components, which reduces manufacturing cost.

Reason 4. There is no 70 mm lens currently available, and if the aperture is f2, this would fill in a hole in the current list of available primary lenses. (I really like a small telephoto of this size. It makes an excellent close-up portrait lens).

Second Lens – is not a lens but it is a convert which allows a full frame lens from canon (or nikno) to be mounted on a m4/3 body that integrates all the electronics and which provides a 2 fstop improvement to any full frame lens mounted onto a m4/3 body. The original focal length / angel view of the lens would be preserved.

Reason. People pay thousands of dollars more for a lens that has even less than 2 extra f stops. Every canon owner and every Nikon owner would by a m4/3 body just to uses their lenses with this extra light gathering capacity with their own lenses.

Lower on the list, are some telephoto lenses, These take less reengineering to fit apc optics to map onto the m4/3 sensor, telephoto light paths to the sensor are more direct.

3. Their 150 –500 mm 5.6 6.3 lens for aps sensor, could be a bit faster in m4/3 format and with its silent focus, could be a real asset to nature photographers with video.

I do not see them making any wide angle lens, yet. Nor would I think they would make any new faster zooms. I’d like to see them, but I think they know that these type of lenses are going to be offered first by Panasonic or Olympus. I’d like to be wrong about this.