Help to choose best lens for sharp portrait fotos listed the lenses in the topic

Hello im considering following lenses
The purpous for the lens should be make sharp portrait fotos, like face pictures, upper body and face pictures.

Canon EF 100mm F2,0 USM

Canon EF 50mm F1,4 USM

And another question whats the difference with thouse 2 lenses and witch one gives sharper pictures. The price of Canon EF 50mm F1,8 II is around 80-100 dollars but the Canon EF 28mm F1,8 USM is around 450 dollars so why it costs it so much more sharper faster etc?

Welcome. Looks like you joined many years ago but this is your first post.

The problem here is more of a focal length issue (my opinion). All the lenses you listed work well for portrait work. I assume you are shooting crop (rebels, xxD's, 7D)? If you want to shoot more than head and shoulder you might want to consider sticking with a 50mm which will already be a little tight indoors.

Cost difference between 28mm 1.8 and 50 1.8.... Many reasons, build quality is one, USM focus another, and wider angles are a little more complex than longer lengths production wise. (that is my humble understanding though this list isn't conclusive).

I started with the 50 1.8 as my first prime which delivers fantastic IQ/price. The 50 1.4 will only give you a little better sharpness at wide apertures and corners with a micro-USM motor and more pleasing bokeh... Only you can decide if the cost difference merits it.

Really you can't go wrong with a 50mm to start out as all deliver on different levels.

If you need wider look into: 35 f2, sigma 30 1.4, 28 1.8, and/or 35L.

If you want longer both the 100 f2 and 85 1.8 are excellent value.

All perform well and you are splitting hairs mostly here and there regarding value/sharpness/rendit​ion/etc...

The 50mm don't have full USM , but some people have great luck with it. Canon might be doing and update. Also their is the sigma too.

I hear ton good from the 85mm 1.8

The 100mm f2 is a great portrait lens.

Sigma AF 50mm F1.4 EX DG HSM Canon well im also considering this lens because this one is Dpreview.com - Highly Recommended

Anyone tryed the sigma 50mm lens?