"Does EA lead the band? Enterprise Architecture and SOA implementations share a common goal... Industry observations suggest that the end result is best when organizations maintain both perspectives".

The answer is in the scoping of the architecture development.

EA addresses the whole Enterprise, although in practice it is often limited to an Enterprise wide IT architecture.
SOA, approached on a "project by project basis" has a limited scope compared to the EA.
SOA, as an architectural style and technology stack, can be adopted by any system development project not only by an Enterprise Architecture.

EA may be developed without SOA and SOA may be implemented without implementing the EA.

To compare the approaches SOA must be taken first in the context and scope of an EA development.
In this context, SOA is the architectural style and the IT technology chosen for the development of the To-Be Enterprise Architecture e.g. a SO target Enterprise Architecture. SOA does not apply to As-Is or specifically aims to align technology to business strategy, although there should be requirements in that sense.
Once, SOA is adopted at the Enterprise level, an EA program is on-going, SOA projects would be executed as a portfolio.

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