At The Same Focus Length & Aperture, Which Sigma Has Better IQ Than Canon

Edit: The Lens With The Same Focus Length & Aperture, Which Sigma Has Better IQ Than Canon

No Zeiss, Please

Sigma 50mm f/1.4 > Canon 50mm f/1.4

FF or APS-C? Or do you not care?

Sigma 180mm f/3.5 Macro beats the Canon version from f/3.5 through f/11 on APS-C.

Sigma 400 f/5.6 (no longer in production) beats the Canon 400 f/5.6 at f/5.6, basically ties at f/8, and loses beyond that.

15mm F2.8 fisheye better than the Canon 15mm F2.8 fisheye at all apertures, and the smaller MFD is also great.

FF & Crop All Good

arentol wrote in post #11909565
Sigma 400 f/5.6 (no longer in production) beats the Canon 400 f/5.6 at f/5.6, basically ties at f/8, and loses beyond that.

If you are talking about Sigma 400mm f/5.6 APO for Canon AF Per PhotoZone lens performance summaries, this is the result (based on 5 stars):

Performance wide open * (poor)
Performance stopped down ** (ok)
Distortions *** (significant)
Vignetting *** (significant)
Flare * (heavy)
AF speed * (very slow)
Build quality ** (not so good)
Optical verdict 1.6 (poor)

Sigma 30 f/1.4 > Canon 35 f/2 and Canon 28mm f/1.8
If that counts. xD

RPCrowe wrote in post #11909805
If you are talking about Sigma 400mm f/5.6 APO for Canon AF Per PhotoZone lens performance summaries, this is the result (based on 5 stars):

Performance wide open * (poor)
Performance stopped down ** (ok)
Distortions *** (significant)
Vignetting *** (significant)
Flare * (heavy)
AF speed * (very slow)
Build quality ** (not so good)
Optical verdict 1.6 (poor)

No.

Sigma AF 400mm f/5.6 HSM APO macro

Photozone rates it 3.5/5 optical, 4/5 mechanical.

Edit: I think the one rated highly has a longer ugly grip with lines on it, kind of weird finish. The one ur thinking of has a shorter more crinkly cross-hatch kinda thing in the middle. God that made no sense, sorry.

woos wrote in post #11910316
No.

Sigma AF 400mm f/5.6 HSM APO macro

Photozone rates it 3.5/5 optical, 4/5 mechanical.

Edit: I think the one rated highly has a longer ugly grip with lines on it, kind of weird finish. The one ur thinking of has a shorter more crinkly cross-hatch kinda thing in the middle. God that made no sense, sorry.

Is this the one you're talking about?
http://cgi.ebay.co.uk …em3a637717a6#ht​_500wt_949

If it is I may go for it (if the price is right!) even though it'll only work at f/5.6.

Sigma 85 > Canon 85L at all apertures 1.4 and up.

gotaudi wrote in post #11909356
Sigma 50mm f/1.4 > Canon 50mm f/1.4

Really?

arentol wrote in post #11909517
Sigma 180mm f/3.5 Macro beats the Canon version from f/3.5 through f/11 on APS-C.

+1 and it beats the canon at non-macro distances

edmyloo wrote in post #11909816
Sigma 30 f/1.4 > Canon 35 f/2 and Canon 28mm f/1.8
If that counts. xD

Sigma 30 doesn't even come close to these two on FF .

All the reviews of the Sigma 30 1.4 that I have read show it to be extremely sharp in the center, but not at the corners of the frame. There, the Canon 35f1.4 and the Canon 35f2 are both better.
All the reviews I have seen have the Sigma 30f1.4 better, meaning sharper, than the Canon 28f1.8.
My copy of the Canon 35f2 is consistent with the review at SLR gear.com.

Sp1207 wrote in post #11911108
Sigma 85 > Canon 85L at all apertures 1.4 and up.

Really? I looked at your gear and you have neither! How do you know?