All your combos are great. Althou I don't have any of limiteds, I do have FA 50 f1.4, Porst 55 f1.2 and M 35 f2 to mention some. However most of my photos are taken with Tamron 28-75 f2.8 even thou I always carry my FA50 1.4 in the bag. Versatility of decently fast and sharp zoom just outwaights sharpness of the primes in most cases, especially since the kids tent do grow up and move much more, so if you want to capture some "action" a zoom is a welcome tool (unless you make heavy postprocessing with cropping and so).
Here is an indoor example with Tamron 28-75 f2.8 on K-7 (ISO 800, focal length 50mm, f2.8 1/45 s, auto white balance with light coming from those energy saving bulbs) with no postprocessing.