I don't know whether I should laugh or be shocked...?

How did you do that? How did you get exactly the same stuff at exactly the same time?
I donno.
Time was exactly the same (19:38, Spring). All I did was start at KSEA and then slew upwards with the weather theme 'fair weather', aligned Mt.Rainier to the left of the screen then took a picture.
The fs9 photo has Flight Environment textures, Ground environment textures, and some Real Environment pro textures. The fsX is stock apart from the sky textures and the landclass.
I can easily tell the diferance because:
1: That Cessna 172 is only in fsX unless you ported it to fs9 in which case most likely doesn't work.
2: Autogen, I have yet to see fs9 autogen look anything like FSX's.
3: Ground textures have a resolution of 1metre compared with fs9's blurry 4 metre.
4: Text is significantly smaller in fsX
5: Water textures are fsX
No I am not pulling your leg..... LOL!
Okay mate, wasn't 'accusing' you of anything, just very surprised at the similarities. I don't have FSX, so I don't know all the differences, and, for example, your water textures are almost invisible, the Cessna could be a repaint etc....
What this basically means, I suppose, is that for the "fair weather" theme the clouds are not generated randomly, but the same cloud textures always start at the same position relative to the plane. FSX obviously uses the same code for this as FS9 (and why not) but with fluffy clouds.
You can get fluffy clouds like that in Flight Environment too, you just have to choose them. You can get the same hazy, syrupy atmosphere in FS9 too, using Real Env, FSAtmosphere, FE, ASG... so for me I really can't see that the second pic is clearly FSX at first sight. It's only the text which really tells me, now you point it out.
As I said in my original post, I can't see a big difference in
these particular shots. Of course, go to the right place and FSX looks amazing and much better than FS9. Go to the wrong place and.... ;D
Anyway, don't like to be a pedant but your FS9 pic is, as you say, crammed full of payware, so this is moving to the payware forum, lol.... ;D