<p>Thank you all for your thorough responses. I appreciate all the additional information, although I think we may have drifted away from my original question.<br>
I realize that the ideal situation would be shooting with a tripod, but most of my shots are lifestyle portraits, not posed, therefore a tripod is a bit unrealistic. I am definitely going to test my camera and lenses to ensure they are performing as they should.<br>
I was editing a RAW photo last night that was shot on my 35mm at 1000 ISO, 1/800 sec at F2.2 and its just not clear, almost unfocused. I was pretty close to the subject as well. I use back button focusing and really take the time to compose my shots. Yes, I shot open...but this really should have been a clear image and it's not. So there could something going on with my focus. I will have to look into this. <br>
My most common issue is when I am shooting in low light, have pushed my ISO to 2500, which after that on the D7100 starts to look pretty grainy, and am trying to keep my shutter speed above 250. Keeping my aperture above 4 to make sure I am getting everything in focus becomes rather difficult. I just don't get enough light. <br>
I definitely do not want to spend more money on a camera that isn't going to give me much more than my D7100, but I also cannot continue to have my images looking like this.<br>
Your advice is invaluable, so I appreciate all responses.</p><div></div>