I really like the composition and colors!
I personally think the image could be a bit sharper, but I still like it very much.
If you feel your photography is exceptional and you are a top photographer, try sending your images to Nat Geo.
They only have one rule. You must send them the RAW image aswell. If its tweeked, its in the bin.
Dont believe me? Then give it a try.
I have shot enough in Arizona, USA and Southern Israel (similar harsh light during midday and dust in the air) to know that if you don't shoot at the right times of day, you WILL get harsh, flat images. Filters help, but it's a battle, even in post processing.
That dust in the air becomes a major advantage in the morning and particularly in the evening, however, producing amazing sunsets unrivaled in other environments. It's difficult when you can't control the time of day you shoot, because I think you will find that the really stunning pictures of the pyramids were almost certainly not taken at the time of day that you were shooting.
I wonder if the "waves" from the heat inbetween you and the pyramids is causing the lack of perceived sharpness. I don't know the technical term, but you know in the summer when you look at the road or the hood of your car and it blurs everything?
It's from the refraction of light as it goes through air of varying density. And I think it's a decent guess that the combo of that, and the apparently bad Cokin CPL, that caused the softness. But the conversation seemed to move on from that into a chest thumping competition of the 'rules' of photography.
Also .. I wasn't using the 100 f2 nor the 24 2.8 non IS.
That was with the 24-105L I think.
If you look at the-digital-picture resolution charts, you'll find out that if you're shooting at small apertures there isn't any point to using a prime lens.
I find my 100 f2 to be inappropriate to use during the day. Too easy for purple fringing to occur if the AF misses, at f2.
The 24 2.8 has beautiful softness/vignetting off centre. So it's good to focus stuff in the centre. For daytime, it's ok - but watch the flare! That lens LOVEs to flare.