135L FF vs 85mm f1.8 on crop. Any comparison?

As it is basically the same FC, I was wondering if the difference was obvious.

I plan to get the 135L as my first L when I'll switch fullframe (6d is tempting me) but now I am seeing threads that say that the Sigma 85mm f1.4 on crop is almost similar to the 135L on FF. It's a bit frustrating as I already have the 85mm f1.8 on crop.

Earwax69 wrote in post #15290039
but now I am seeing threads that say that the Sigma 85mm f1.4 on crop is almost similar to the 135L on FF.

'Almost similar'? 135L on ff destroyed crop + 85mm....

I've had the 85 1.8 and 135 2 shooting with 1.3 crop for years and the 135 blows the 85 away in every way. Not that the 85 is terrible, but they are in different leagues. I used them for sports. So 135 on 5D3 is going to be way better than 85 1.8 on any crop.

Ok thanks. Still, it is quite something to buy a 900$ lens. I am slightly anxious about pressing the buy button!

It's old using a 30D and 5Dc but here:

http://www.seriouscomp​acts.com …s-full-frame-vs-crop-162/

Thanks FEChariot! it's very very similar. Still my 85mm f1.8 is NOT the f1.2. I should see a bigger difference.

Earwax69 wrote in post #15290470
Ok thanks. Still, it is quite something to buy a 900$ lens. I am slightly anxious about pressing the buy button!

Take good care of it and consider it an investment. I've never lost money on a lens when I've gone to sell it.

FF and 135L is a fantastic brotherhood.. I simply love this combo!

projectmayhem713 wrote in post #15290518
Take good care of it and consider it an investment. I've never lost money on a lens when I've gone to sell it.

Same for most of my lenses, kind of investment. When I stop loving it, it goes to a next owner, usually for the same price I paid at the beginning (usually buying used, but in 99-100% condition).

Not exactly the FL that you are asking about, but certainly a comparison of 1) framing, 2) DOF, 3) amount of far background blur
with [1.6FL and FF] vs [1.0FL and APS-C] from exact same camera position

The FF sensor will have better IQ (less pixel density so easier for the glass to resolve), but the DOF and field of view will be pretty much the same (f/1.4 on crop vs f/2.2 on FF).

Honestly a lot of people will tell you there's a huge difference between the two but this advice will be mostly coming from gear heads. I doubt you'll see much difference on prints or even pixel peeping. I'd personally go with the Canon 85 1.8.

Earwax69 wrote in post #15290515
Thanks FEChariot! it's very very similar. Still my 85mm f1.8 is NOT the f1.2. I should see a bigger difference.

Another way to look at this is 85/1.8 on crop would give simular blur to 135/2.8 on full frame (85/1.8 + 47.2 versus 135/2.8 = 48.2), which means you could get prime level blur with the convenience of using a 70-200/2.8 zoom.

Either lens will perform quite well on a FF or 1.6x body. The only advantage I believe that is worth noting is that the 135L delivers a more saturated and contrasty image. I have both lens and they each have their own specialized uses.

From the bokeh comparisons I have saw. The 135mm f/2 on a full frame will be jaw dropping. The 85mm f/1.8 on crop is nice but it's not as dreamy.