Can you do a benchmark demonstrating the performance nginx + php-fpm + APC versus Pancake + CodeCache under high concurrent load, including serving of large (>5

Can you do a benchmark demonstrating the performance nginx + php-fpm + APC versus Pancake + CodeCache under high concurrent load, including serving of large (>50kb) assets? Ideally, a benchmark that produces a chart of response time (Y) against concurrency (X) for each product would be great, because "serves one user really fast" is practically worthless for real world purposes. I want to know what the point is at which each server buckles.