In 1946 Kuomintang troops numbered approximately 4.3 million. China's Bitter Victory: War with Japan by: James Hsiung has much of the numbers you would need, helped me a lot when writing papers on Mao. I'm not sure if that is the answer for 'professional' troops. However it is interesting to note that they out numbered the CCP by almost 4x, at 1946, and within 3 years that number had flipped.