Hi Jeff...thanks for your reply. Budget is somewhat of a factor for sure. One trade off I'm considering is an M3 bundle with this pacakge below for ~$2,900 leaving some $$ for a couple more lenses . I'm seeing just the M4 with this lens, no bundle for around $3,600 .
What do you shoot, primarily? Are you someone who crops quite a bit? Is action photography one of your main interests? There are some differences in these cameras, but IMO they wouldn't make a huge difference to most people.
I mainly shoot landscapes and architectural, but will be looking to do more portraits with the new camera and may do more cropping (my first mirrorless full-frame). I decided to pull the trigger on the M3 bundle with the Sony 24-105 lens as an all-around. I have about $2k left over in my budget and am now reviewing options for 1-2 prime lenses....a fast, 24mat least one 24mm or 35mm 1.4. I've heard +'s and -'s on non-native lenses that are typically sold at discounts to Sony's native lenses but they seem to be good values if the performance and reliabilty is there...(Zeiss, Sigma Art, Samyang, Tamron, etc.).
Welcome and thanks for joining Bob. I've not heard of Koah Pro NP-FZ100 batteries but a lot of third-party batteries will not work correctly in the a7III or a7IV. Sometimes they do work but display a warning first and the battery remaining indicator doesn't display. I'd be interested to know how you get on with them. Hopefully if they are bundled the seller has tested them. There are lots of excellent non-native lenses out there, with both Tamron and Sigma producing some excellent glass. Often when it comes to AF performance the native Sony lenses will do best, closely followed by Tamron then Sigma. So definitely worth doing a little research here.
I have to say, I have one non-Sony battery. Besides the lower rating, I get tired off the warning messages. I just use it now for powering the camera when I'm fiddling with it in my office.. It was not a Koah, have not heard of that one.
