Hi jerr3d
As you are in the business, so to speak, you will already realise that the original Sony DSLR photo has undergone some changes which make it impossible to match resolution.
Picture on Sony DSLR - transferred to iPad, how? Don't know. Model and vintage of the iPad is not known - early standard model or latest Retina Pro model?
And then there's the email. Sent in original size/full resolution or compressed for the email?
To make a meaningful comparison you need the DSLR specs, the iPad specs, how the transfer was made, and what compression, if any was used for the email.
It's a complicated issue. Let's see if we can sort this out.
Ian