You should be able to PP decent image files in DPP. Some prefer it to LR, but of course it is much much more than just a raw converter.
Your images are interesting but not the sort of thing that is best for checking lens or camera. A vertical target and an inclined ruler will do fine for setting up auto focus. My favourite way is to photograph a single flower on the lawn looking down at about 45 degrees. You can soon see if the grass either side is in focus and so see if you are front or rear focusing. I have recan but never use it now.
If you check focus and set it right but still don't get images you think are sharp enough you should try a tripod and or a bean bag.
If you still can'tget Iimages you like talk to an experienced photographer. There are lots of us about. And most are quite willing to help a youngster understand and progress. Who knows they might even say the problem is your lens. That's not likely but it certainly could be.
I hope this helps your development as a photographer and gives you no offence. As you do seem rather dismissive of the help offered so far.
first of all I apologize for appearing dismissive, that's not what I intend to be. I assume that results from the struggle of getting taken serious as an 18 year old. Of course that's no excuse, I am deeply sorry. I value this forum and the people taking their time to help others. I learned a lot from reading this forum for about two years. Thank you!
To the lens, I found out that the lens backfocuses at both of my bodies, so I will take my camera and all my lenses to the local cps repair center and get the lens calibrated to the camera. That won't be coming cheap but I need a reliable setup since it's summertime the most profitable time for me.
I will continuing to use this lens for the summer, despite being not fully satisfied. Most clients won't notice the difference anyway. For my personal stuff I will stick to my 100L and 50CompactMacro. After the summer I will reevaluate the situation as to keep the lens, make the move to primes, try to get a different copy etc.
I am very grateful for advice about how to use this lens properly as I think it's very likely that user errors are involved. I tried using this lens on a tripod successfully after figuring out that I have to turn the IS off manually since there is not tripod detection or it doesn't work or whatever. For long exposures of night architecture it's great. It's not so great as a macro lens used with the 25mm extension tube compared to the 100L and 50 CompactMacro.
I still have to figure out how to use it properly as a portrait lens as I still fail to get the eyes in Focus at 100mm+ f/2.8 using the 5d2. Focus/Recompose doesn't work and the outer focus points are a bit hit and miss. Surprisingly the outer Points work well when using this lens and camera for table tennis shots. Strange. I hope somebody can explain that to me...
Please accept my apology.
Looking forward to further advice