Lens advice: which prime should I buy first?

[Positron]

Positron,

Later on you admit you don't even "have" a MK3 to try the nifty fifty on, that's funny

I do and brand new 70-200 F/2.8 II, 16-35 F/2.8 II and 24-105 F/4.
There is NOTHING unbalanced about the shots from the nifty on the MK3, in fact, I think that in poorer indoor light, they have given the sharpest best quality images out of all of my lenses.

So, rather than "speculating" when you give someone advice, how about referring to direct experience?

ET

I wasn't in any way referring to image quality, but rather physical weight distribution. Apologies if my wording was unclear. While I don't own a 5D3, I've spent quite a bit of time using a friend's 5D2 and with my 50mm f/1.8 the camera is so back-heavy that it's just awkward to use. The images it puts out are still phenomenal.

 

[briansquibb]

I'd recommend shooting for a while with the 24-105mm and using that experience to guide your decision. The choice of prime lens depends entirely on what you want to shoot...

+1 that covers both the 35, 50 and 85 range - so from analysing what focal length most of your pictures are taken at you might get some pointers to which prime to buy

 

[iso79]

Get the holy trinity i.e. 135mm f/2 L, 35mm f/1.4 L, and 85mm f/1.2 L.

 

[mike_s_one]

If money is an object go with the 50mm f1.4! It's a great lense that'll give you great results on a full frame camera. If you don't mind spending money and want the best canon lenses money can buy follow the previous posters advice, shoot your zoom and see which focal length you use most and get the according L- prime.

Happy shooting!