Thanks everyone for your assistance. Glad to be part of this wonderful group.
I used spend lot of time in post processing since I like to have the pictures more dramatic appearance. May be the 14 bit format can help in this when compared to 12 bit. But again, am not too sure on this.
Right now, am just shooting my 9 weeks old daughter and that is the main reason I bought my Sigma 1.4 art lens even though I have Pentax 50mm f1.8. So far the results are good in both the lens.
So right now, I can either go for Pentax K1 if it would make much of a difference on the image quality or I can add a nice telephoto lens to my existing arsenal and try to run with it until I hit a dead end with my K30. The Pentax DA* 300 is kind of interesting
Regards,
Matt