Very nice shot! and nicely done in PP.
The sensors in our newer bodies (K5 and on) have incredible dynamic range so shooting in Raw at ISO 100 lets you bring up a lot of shadow detail. It's pretty easy in Lightroom. Even at higher ISO, it works quite well. While I do the occasional landscape shot, I primarily do sports and a lot of motorcycle and ATV racing. The light is often harsh. When shooting motocross, when the racers are getting big air, they are often almost a silhouette against the bright sky. I usually shoot at ISO 800 or higher to get the faster shutter speeds I need and also at f/11 for the best DOF and also it's the sweet spot on my relatively cheap Sigma 70-300 which can get covered in mud after a day shooting this stuff. I spot meter on the rider but when your subject is moving fast, you can get the sky and the rider is nothing much more than a shadow. This is an ISO 800 shot from last weekend with the shadow slider moved to +70 in Lightroom. You do have to play with the Clarity, Contrast, and other adjustments.
I did over 700 shots on Sunday. All my shots generally fell into 3 different groups. The pretty good ones that just needed some Clarity and minor adjustments, the somewhat overexposed, and the underexposed. I make a few presets and then go through all the shots with just a couple of clicks of the mouse, first for the preset and then export. There is the occasional dust spot on the sensor that needs removing but in racing, they tend to blend in with the flying chunks of mud.